A community can decide to cast someone out, reprimand them, imprison them, etc. The whole idea of restorative justice can actually exist when a community is able to address it.
How can you throw them out? Prevent them from returning?
Do you think the robbers will just stop, because you said "Stop!". I feel like you're trolling here. I could of course be wrong, but it feels that way.
I hope Merriam-Webster clears that up:
"Definition of government
1 : the body of persons that constitutes the governing authority of a political unit or organization"
Some people just give 0 fucks about anyone besides themselves.
Most people give 0 fucks about anyone outside of a moderate group of acquaintances and friends.