So with your great imagination, please suggest a way to have a functioning society where we don't have people causing harm to others without a team of people trained to physically stop them, bring them somewhere where they can be rehabilitated, and if they can't be, isolated from the rest of society to prevent further harm?

My mind is open and my ears are too.

This is a pretty old talking point, and I'm about to go eat some dinner so here's some info from classical anarchist perspectives copied from reddit, which can work as a starting point for your learning journey.

Guillaume says “all able-bodied inhabitants will be called upon to take turns in the security measures instituted by the commune”, calling this a “Communal Police”.

Merlino posits a question from a non-anarchist asking “Would there be need for a government, a parliament, a cabinet, a police force, a judiciary?”, which he answers with "Nothing of this kind would exist in the anarchist system". However, he still suggests some kind of social defense institution organized as a public service, though I don't know the details.

Kropotkin believes most crimes would simply disappear in an anarchist society (under the common anarchist assumption that crime is only caused by capitalism), but still says "here surely will remain a limited number of persons whose anti-social passions − the result of bodily diseases − may still be a danger for the community". His solution for such people is a kind of quarantine, not in prison but in a community empowered to rehabilitate them. Call it an open compound, maybe. Presumably the community members are responsible for herding offenders into the compound.

Malatesta proposes giving citizens the right to defend themselves,"Perhaps we would come closer to a more comprehensive formula by asserting the right to forcible self-defence against physical violence as well as against acts equivalent in manner and consequences to physical violence".

tl;dr: Community driven, rehabilitation lead approaches. Violence is justified in defense.

Fuck Reddit and Fuck Spez.