LFotW: Slippery Slope

This logical fallacy is the argument that a position is not consistent or tenable because accepting the position means that the extreme of the position must also be accepted. But moderate positions do not necessarily lead down the slippery slope to the extreme. There may be legitimate reasons to accept intermediate positions.

For example, those, like Thomas Szasz, who believe that mental illness does not exist have argued that if we classify depression as an illness that will lead to governments classifying political protest as a mental illness, because they are both mental states. This slippery slope argument ignores the important differences between a debilitating mood disorder and a political opinion.