I think its a kind of tone-thing maybe?

I think the point is that the justification for inclusion of the edge case in the category is much weaker than what forms the category; for example 'MLK breaks the institutional law' vs 'criminals are destructive and self-aggrandizing. Not to mention that in the MLK case that law was being used in an incredibly biased way. The 'MLK wanted to overturn valuable social norms' is a stronger argument than 'MLK was a criminal'

In the rape case, the justification is the same as the category definition: sex happens without consent being given, and this is destructive to the victim.

One incredibly common form of WAitW is calling things 'Cultural Marxism'. I don't know if anybody knows what cultural Marxism is anymore. In these cases its 'Motivated by some forms of marxist theory' vs freaking Stalin.

Affirmative Action and Racism: