I meant it as the fact that the witches would have to act in self defense, since they were hunted, or was I misremembering this manga's lore
I'm reluctant to bring up jews given the Semitism issue in today's current events, but that's like saying you expect that many jews killed Nazis, if only in self-defence. Historical evidence shows very few actually did, outside of organized retaliation like among internment camp inmates.
Turns out humans have a natural and in most cases cultural aversion to killing other humans that is very hard to overcome. No reason to think witches are any different.
Lets even flip it around shall we. Since the witches have magic, why would witches have to resort to killing people?