Slippery Slope Fallacy
A slippery slope fallacy argues that one first step will inevitably trigger a sequence ending in an extreme outcome. The key mistake is not warning about consequences. It is overstating how straight, certain, and uninterrupted the path to those consequences really is.
These arguments become persuasive because the ending is vivid. Once catastrophe is imagined clearly enough, the first step starts to feel intolerable. But real social and political systems are branching systems, not clean chains. Every intermediate step carries its own probability, friction, and possible interruption.
The right response to a slope claim is to unpack it. What are the actual links? How likely is each one? What other paths could events take instead? A consequence can be possible without being inevitable, and responsible reasoning keeps that distinction visible.
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See also: critical-thinking-and-logical-fallacies for how this fallacy fits alongside the full pattern of argument failures.