Every argument has hidden assumptions. Can you identify the unstated premises that make conclusions seem to follow?

Exactly! The argument only works if we accept the hidden premise: "All (or most) politicians lie." Without this unstated assumption, the conclusion doesn't follow from "she's a politician." This is an ENTHYMEME—an argument with a hidden premise. The hidden part is often the weakest part.

Hidden premises are where weak arguments hide their weakness. By not stating "all politicians lie," the argument avoids scrutiny of this dubious claim. Once you make it explicit, you can challenge it: "Is that actually true? Are there no honest politicians? What's the evidence?" Exposure enables evaluation.

Complete structure: PREMISE 1 (stated): She's a politician. PREMISE 2 (hidden): Politicians lie. CONCLUSION: She's probably lying. The conclusion only follows IF both premises are true. Challenging either premise challenges the conclusion. Most productive debates are about which premises to accept.

Look for this pattern everywhere: "You're X, so you must Y." ALWAYS hides a generalization: "All Xs are Y." Examples: "You're a teenager, so you're irresponsible" (hidden: all teenagers are irresponsible). "You're an engineer, so you're bad at emotions" (hidden: all engineers are). Make the generalization explicit, then evaluate it.

If the hidden premise were "THIS politician specifically lies," then saying "she's a politician" would be unnecessary. The argument specifically uses her CATEGORY (politician) to draw the conclusion. This means the hidden premise is about the CATEGORY: "Politicians lie"—a generalization, not specific knowledge.

The structure is: "She's a [category], so she [has trait]." This only works if the hidden premise is "All [category] have [trait]." Otherwise, why mention the category? The category is doing logical work—connecting to a generalization that applies the trait to all members.

The hidden premise is "Politicians lie" (or "most politicians lie"). This explains why mentioning "she's a politician" is relevant. Once you see this, you can challenge it: "Do ALL politicians lie? What's the evidence? Are there no honest politicians?" Making generalization explicit enables evaluation.

Watch for "You're X, so you must Y" arguments everywhere. They ALWAYS hide a generalization: "All Xs are Y." Make it explicit! "You're a teenager, so you're irresponsible" hides "All teenagers are irresponsible." Is that true? Probably not. Hidden generalizations are often the weakest point.

The argument jumps from "she's a politician" to "she's probably lying." But these two statements have no obvious connection! Something is missing. What must be TRUE for "being a politician" to imply "probably lying"? There must be a hidden assumption connecting the category to the conclusion.

The hidden premise is "Politicians lie" (or "most politicians lie"). This unstated assumption is what connects "she's a politician" to "she's probably lying." Without this premise, the conclusion doesn't follow at all. The argument hides this premise because it's the weakest part—if stated, it invites challenge.

Hidden premises are where weak arguments hide their weakness. By not stating "all politicians lie," the argument avoids scrutiny. Once made explicit, you can challenge it: "Is that actually true? What's the evidence? Are there no honest politicians?" Exposure enables evaluation. Hidden ≠ nonexistent.

Ask: "What must be TRUE for this conclusion to follow from these premises?" If there's a gap, something is hidden. "You're X, so you must Y" ALWAYS hides "All Xs are Y." Make generalizations explicit! Most hidden premises are generalizations—and they're often false or overstated.