The paradox of tolerance is not some narrow tool, it can be used in many contexts. In particular, it can be used to demonstrate that, if you want to exist in a society that has a coherent notion of "self-defense" in general, you must admit the existence of the paradox and the necessity of judging actions in the context of aggression or defense. To wit: killing someone is against the law, but killing someone who's trying to kill you may be permitted, but even in that case, the aggressor still isn't allowed to kill you just because you tried to kill them in self-defense; they forfeit the right to self-defense by being the aggressor.