You're reading my comment backwards. I'm not saying it's okay to exile someone just because you have 20 people, I'm saying it's absurd to consider it a problem that you can't exile someone when you can't even get 20 people together to do it.
You were the one complaining about not getting to exile them. You were the one wanting to use a power structure to commit violence. I'm just saying you can't cheat by using cops as a force multiplier.
If you want a power structure to commit violence you're going to have to convince people that its existence is just. You can't just say that the people doing it are cops and therefore shouldn't be stopped.
And I disagree that the Mafia arose in southern Italy due to things going on in the USA. I hope that helps. (Though to throw you a bone - people want justice and safety, and without anarchist principles there are many unjust ways to provide a shitty version of the two).
I’m not saying cops are good, but most of the anarchists I’ve spoken to have the idea that it would be great for everybody to be willing to be violent with others when disagreements arise.
Those anarchists aren't telling you to be violent over a disagreement, they're telling you that if you aren't willing to be violent over something you shouldn't be able to send a cop to be violent for you.
When a law requires constant violence to be upheld, that doesn't mean you should personally be violent, it means your law sucks. Cops are a crutch that allows unjust laws to be enforced.
What do you plan to do with a hoard of guns and ammo? Get yourself killed so people can loot your bunker?