Killing another human is not ethical. Domination can make killing another human necessary. Your death could be necessary if you are dominating other humans.
Sorry man. (a) I don’t know who John Brown is, (b) I’m not participating in an interrogation whose purpose is to determine whether I’ll be included in your mass killing.
I assumed you are familiar with American history. You assumed I want mass killing. I will simplify my question. When is it necessary to kill another human?
For education, John Brown was an American Abolitionist. That means he did not think anyone should be enslaved. To keep it simple, he attempted to spur a slave rebellion. He killed slave owners.
My threshold is the 'violent MAGA crowd'. The ones too far gone into the alt-right cult. If some twitter user calls you a nazi, that means shit unless you were acting like a nazi.