We both have a right to not be assaulted. I don't have a right to assault you, you don't have a right to assault me. However, if you assault me, you forgo you

We both have a right to not be assaulted. I don't have a right to assault you, you don't have a right to assault me. However, if you assault me, you forgo your right to not be assaulted. I now have the right to assault you in self-defense. At least, I think this is the logic. Not sure if self-defense counts as assault in a legal sense. A similar argument probably applies to police hitting people as well as forms of consensual violence.