English Composition 101: Rhetoric and Persuasion - Logical Fallacies - All types

What It Is

Logical fallacies are errors in reasoning that can undermine the validity of an argument. For example, a student might write, "The new policy is bad because it's new." This statement is an example of an ad hominem fallacy, which attacks the policy based on its novelty rather than its merits. In academic and professional writing, it's essential to avoid logical fallacies to build credibility and persuade readers.

Core Principles

• Definition of logical fallacy: A flaw in reasoning that can make an argument invalid or misleading.
• Types of logical fallacies:
  • Ad hominem: Attacking the person rather than the argument.
  • Straw man: Misrepresenting an opponent's argument.
  • False dichotomy: Presenting only two options when there are more.
  • Appeal to authority: Relying on an expert's opinion without evidence.
  • Slippery slope: Assuming that one event will inevitably lead to another.
  • Bandwagon effect: Using popularity to justify an argument.
  • Appeal to emotion: Using emotions rather than logic to persuade.
  • False cause: Assuming a cause-and-effect relationship without evidence.
  • Hasty generalization: Making a broad conclusion based on limited evidence.
  • Red herring: Introducing an irrelevant point to distract from the argument.
• Structural formulas:
  • Claim + evidence + analysis = argument
  • Thesis statement = claim + roadmap
• Examples of correct vs. incorrect usage:
  • Correct: "The new policy is bad because it increases costs for students." (Evidence-based argument)
  • Incorrect: "The new policy is bad because it's new." (Ad hominem fallacy)
• Common formatting or citation rules:
  • MLA: Use a Works Cited page to cite sources.
  • APA: Use an References page to cite sources.

Common Writing Errors

Error 1: Appeal to authority

Error: "According to a famous scientist, climate change is real."

Why it fails: This statement relies on the scientist's authority rather than providing evidence.

Correction: "Studies have shown that climate change is real, and a recent study by a renowned scientist supports this conclusion."

Error 2: False dichotomy

Error: "You're either with us or against us."

Why it fails: This statement presents only two options when there may be more.

Correction: "We have different opinions on the issue, but we can work together to find a solution."

Error 3: Slippery slope

Error: "If we allow same-sex marriage, next we'll have to allow polygamy."

Why it fails: This statement assumes that one event will inevitably lead to another without evidence.

Correction: "While some people may be concerned about the implications of same-sex marriage, there is no evidence to support the claim that it will lead to polygamy."

Quick Application

Scenario 1: Arguing that college tuition should be free

Prompt: Write a thesis statement.

Model answer: "While college tuition is a significant expense, making it free would be a more equitable and effective way to ensure access to higher education for all students."

Explanation: This thesis statement presents a clear claim (making college tuition free) and a roadmap (ensuring access to higher education for all students).

Scenario 2: Arguing that a new policy is bad

Prompt: Write a paragraph explaining why the policy is bad.

Model answer: "The new policy is bad because it increases costs for students, which can lead to financial burdens and decreased access to higher education. Furthermore, the policy has been shown to have negative impacts on student outcomes in other institutions."

Explanation: This paragraph presents evidence (increased costs, negative impacts on student outcomes) to support the claim that the policy is bad.

Scenario 3: Arguing that a new technology is beneficial

Prompt: Write a paragraph explaining why the technology is beneficial.

Model answer: "The new technology is beneficial because it has been shown to improve student engagement and outcomes in various studies. Additionally, it is more cost-effective than traditional methods and can be easily integrated into existing curricula."

Explanation: This paragraph presents evidence (improved student engagement and outcomes, cost-effectiveness) to support the claim that the technology is beneficial.

Last-Minute Revision

• Use transition words: Use transition words (e.g., however, in addition, therefore) to connect ideas between sentences.
• Use proper punctuation: Use commas, semicolons, and colons to separate items in lists, set off nonessential clauses, and indicate relationships between ideas.
• Use correct citation: Use MLA or APA citation style to credit sources and avoid plagiarism.
• Use active voice: Use active voice to make writing more engaging and clear.
• Use clear and concise language: Use simple language to convey complex ideas and avoid ambiguity.
• Use headings and subheadings: Use headings and subheadings to organize ideas and make writing more readable.
• Use bullet points and numbered lists: Use bullet points and numbered lists to present information in a clear and concise manner.
• Use tables and figures: Use tables and figures to present data and information in a clear and concise manner.
• Use a clear and concise title: Use a clear and concise title to convey the main idea of the writing.
• Use a strong conclusion: Use a strong conclusion to summarize the main points and leave a lasting impression on the reader.