I’ve actually thought about this type of thing quite a lot, and I’ve come to the conclusion that you’d have to go back to the first Sumerian cities, and convince all the regular peaceful cooperative people to kick out anyone who says anything along the lines of “do what I say or I’ll kill you”.
That’s probably why the peaceful cooperative non violent types tolerated the sociopaths in the first place… Need that bruiser to protect you from the neighboring city’s bruiser