Fallacy
Slippery Slope
Claim one small step inevitably leads to an extreme outcome, without showing why.
Example
"If we let students redo one exam, soon nobody will ever have to pass anything."
A slippery slope argument treats a modest first step as if it automatically triggers a chain of worse and worse consequences, without showing any actual mechanism connecting them.
Some slopes are real: a policy can genuinely set a precedent. The fallacy is claiming the slide is inevitable without evidence that each step actually follows from the last.
Ask what specifically stops the process at step two. If there’s a real answer (a rule, a review, a limit), the “inevitable” slide isn’t inevitable.