Nonviolence works the same way: if you're engaging with someone / some group who isn't violent, there's an expectation that you'll also remain nonviolent. If they pull a gun on you and you happen to be packing (and a quick shot) and shoot em dead, that does NOT bring you down to their level.
The sad thing is, this argument originates from fascists, they just managed to gaslight a whole generation of people that "hypocrisy" is the worst thing to ever happen to humanity, and people should hold the moral high ground to a stawman version of their ideology.
Call me the last fascist in hell then. Y'all can string me up for my crimes when we've eliminated all the threats. Keep your hands clean and I'll shut the door behind me.
If your idea of "resisting fascism" is to remove democratically elected leaders and installing your own leaders then not only are you the fascist but you're the only real fascist in that analogy. That's what fascism means, it's authoritarianism, the opposite of democracy or anarchy respectively.
That's conservative ideology. Liberal only means not conservative. Stop trying to pretend that liberal means centrist. There's already a word for that. It's centrist.