Yeah it's definitely the hardest question to answer imo, but you'd be surprised just how many of those problems are solved simply by society believing in the principles of innocent until proven guilty and trial by your peers instead of street executions by bully squads.

Of course #2 only happens under anarchism for some reason, right?

Realistically the hard problem is not how does anarchy deal with necessary elements of justice in any situation where you gather a bunch of apes together, it's answering it at scale and how to balance needing professional behavior without actually creating a professional enforcement class.