Common Fallacies

Understanding Fallacies: Definitions and Implications

A fallacy is defined as a flaw in logic or reasoning. These flaws typically arise from mistaken or unverifiable beliefs, the use of incomplete or incorrect data, or the dissemination of intentionally misleading statements. Developing an active awareness of fallacies serves a dual purpose: it enables individuals to identify logical errors in the arguments presented by others and facilitates the identification of potential mistakes in one's own arguments. While many types of fallacies exist and often overlap in their identification, specific categories are recognized as foundational for critical thinking.

The Strawman Fallacy

The Strawman Fallacy occurs when a participant in a debate distorts or misrepresents an opponent’s argument to make it appear weaker and more easily refutable. This is achieved by either oversimplifying the opposition’s position or completely mischaracterizing their actual statements. The term "Strawman" dates back centuries and likely originates from military training, where soldiers used straw dummies to practice weapon skills because, unlike real opponents, strawmen do not fight back.

Several examples illustrate this fallacy in practice:

Example 1: John states, “I think it is wrong to deport people who entered the country illegally as children.” Tom responds, “Oh, you think we should open our borders to just anyone. The whole country would be overrun with drug dealers and criminals.” Here, Tom mischaracterizes John’s specific stance on a subgroup as a general desire for open borders.
Example 2: Jim argues, “I think it is wrong to tax the rich so much. Too many taxes stifles job creation.” Bob replies, “You care more about the rich than you do the poor. How could you be so heartless?” Bob distorts Jim’s economic argument into an attack on his character/empathy.
Example 3: Sally says, “I think marijuana should be legal just like alcohol and tobacco are legal.” Pam responds, “You just want to get high all day and never go to work.” Pam misrepresents Sally’s legal stance as a personal desire for laziness.

Ad Hominem Fallacy and Mud Slinging

Derived from the Latin phrase Argumentum ad hominem, meaning “argument towards the person,” the Ad Hominem Fallacy occurs when one side attacks the character or personality of their opponent instead of addressing the actual substance of the argument. This often manifests as "mud slinging," which is the act of maliciously attacking an opponent’s character to damage their image or cause.

Examples of Ad Hominem include:

Example 1: Tim says, “I think Governor Johnson is right when he says we should do more about wild fires.” Molly responds, “I don’t know how you could ever trust a man who cheated on his wife three times.” Molly attacks the Governor's personal life rather than his fire management policy.
Example 2: Betty mentions, “Tom is signing the final paperwork with the adoption agency today.” Nick replies, “I think he is crazy. Everyone knows single guys are terrible parents.” Nick uses a generalization/personal attack rather than assessing Tom’s specific capability.
Example 3: Steve says, “The school just got a new principle. She starts next month.” Mike responds, “I doubt she will do a good job. She was best friends with the last principle, and he did a terrible job last year.” Mike attacks her associations rather than her credentials.

Tu Quoque: The Hypocrisy Fallacy

Tu Quoque is a specific type of Ad Hominem fallacy (Latin for “you also”) and is frequently referred to as the “Hypocrisy Fallacy.” It occurs when an individual attempts to undermine an argument by accusing the presenter of being a hypocrite. However, a presenter being a hypocrite does not inherently mean their argument is factually false.

Examples often involve political discourse, such as highlighting the contrast between a group’s public policy stance and their private rules or past actions. For instance, a speaker might point out that a conservative conference promoting gun ownership has a “No Guns Allowed” policy at their venue. While this points out a contradiction in behavior, it does not address the logic of the argument regarding gun safety or rights themselves.

Appeal to Authority and Anecdotal Evidence

The Appeal to Authority Fallacy happens when someone insists a claim is true based solely on a single expert’s opinion or a single information provider. Critical thinking dictates that "no authority is an island unto itself"; all authority figures and sources must be beholden to peer review. Relying on one person as the absolute source of information should be avoided. An example of this is drinking exactly 8 cups of water a day simply because a single article claimed anything less causes dehydration, without looking at broader medical consensus.

The Anecdotal Evidence Fallacy occurs when a personal story is used to draw broad conclusions about a topic while excluding outside perspectives. This follows the logic: “Because this seems true to me, it must be true for everyone else.”

Example 1: Jim fears failing math because it is hard; Rick dismisses this because he personally found it easy.
Example 2: Debating gun control using a story of a brother saved by a gun versus a sister killed by one. Both are single anecdotes that do not represent total statistical trends.
Example 3: Will cites that 9 out of 10 times seat belts save lives. Wayne counters that not wearing one saved him once, so he will never wear one again, ignoring the mathematical probability.

Bandwagon and Appeal to Pity Fallacies

The Bandwagon Fallacy claims something is true because the majority of people believe it. Popularity does not equate to truth. The phrase “jump on the bandwagon” comes from 19th-century American politics, referring to wagons carrying bands in parades. It was used as an insult for people joining a political party because it was popular or exciting without considering the platform.

The Appeal to Pity Fallacy attempts to win an argument using only pity or guilt. Common examples include PSA commercials featuring sad music and animals (e.g., Sarah McLachlan commercials) or a student asking a professor, such as Mr. Riner, to change an attendance grade from six absences back to full credit because of personal hardship, despite the rules clearly stated in the syllabus.

Correlation Equals Causation Fallacy

This fallacy assumes a cause-and-effect relationship exists between two events simply because they occur simultaneously. Data visualizations often show high correlations between unrelated variables, such as:

US spending on science, space, and technology correlating with suicides by hanging, strangulation, and suffocation with a correlation coefficient of $r = 0.9971$ (p < 0.0001).
Ice cream sales correlating with shark attacks (both increase in summer, but ice cream does not cause shark attacks).
The rise in organic food sales correlating with individuals diagnosed under the Individuals with Disabilities Education Act ( $r = 0.9971$ ).
Marriage rates in Kentucky correlating with deaths from falling out of fishing boats.
Examples also include attributing the rise of COVID-19 to 5G towers or linking gas prices solely to the timing of a presidential inauguration without considering broader economic factors.

Cherry Picking and the Texas Sharp Shooter

Cherry Picking occurs when an argument highlights data supporting its claim while ignoring or belittling data that contradicts it. It is a farmer’s term, referring to a worker picking only the best fruit and assuming the whole tree is perfect. It is also called the “Texas Sharp Shooter Fallacy,” named after a story of a man who shoots a barn wall and then draws target lines around the bullet holes to claim perfect aim.

A notable example is the “Global Warming Hiatus.” By cherry-picking the specific years between 1998 and 2012, one might argue global temperature was flat. However, when looking at the full range from 1880 to 2022, the upward trend is undeniable. Similarly, the Heartland Institute was noted for cherry-picking a specific month in 2009 to claim there was more Arctic ice than in 1989, ignoring the overall seasonal and decadal decline.

Burden of Proof and Slippery Slope

The Burden of Proof Fallacy claims that the opposition must disprove a claim, rather than the presenter proving it. An argument must stand on its own proof. This is common in conspiracy theories (e.g., Moon landing or 9/11 theories), where proponents argue their theory is true because it hasn't been "definitively proven untrue."

The Slippery Slope Fallacy claims a massive event will inevitably follow a small event without providing evidence for the chain of causality. It is associated with the “Snowball Effect” or the “Butterfly Effect.”

Example: Nick argues that if Bob wears a dress to school, all men will eventually want to be women, and the human race will die off. This makes an extreme leap without evidence for each step.
Example: Debbie argues that carrying a gun to a party will inevitably lead to getting drunk, getting in a fight, and becoming a murderer.

Hasty Generalization, False Dilemma, and Red Herring

Hasty Generalization: Making a large claim based on incomplete data. Unlike the Slippery Slope, it doesn't try to identify a chain of events. This is the root of stereotypes, bigotry, racism, and sexism (e.g., "All people who carry guns are murderers").
False Dilemma: Presenting only two options when multiple exist, or making them seem mutually exclusive (e.g., "You either support the President or you hate America").
False Compromise: Also called “Argument to Moderation,” this assumes the middle ground between two opposing ideas is always the correct choice by default.
Red Herring: Redirecting the conversation to a different topic to distract or confuse. The term comes from the 19th century, where a strong-smelling fish was used to distract hounds. In modern discourse, this often appears as "Whataboutism," where an individual answers a criticism by bringing up a different, unrelated fault of the opponent.

Sunk Cost and The "Fallacy" Fallacy

The Sunk Cost Fallacy involves a reluctance to abandon a cause because of past investment (time, money, or effort). In economics, a sunk cost is unrecoverable. The fallacy occurs when one believes they must continue spending or participating simply because they have already spent so much.

The "Fallacy" Fallacy occurs when someone assumes an entire position or argument is 100% false just because a fallacy was identified within it. Identifying a fallacy is about finding a weak point that needs strengthening, not necessarily proving the underlying conclusion wrong.

Questions & Discussion

The presentation concludes by asking students to think of their own examples for each fallacy. The final question posed to the audience is: "Any Questions?"