I know groups that are not a messy mob and entirely voluntary . . . So . . . I respectfully submit that you are wrong.

Also, people in a militia can have a perfectly functioning hierarchy without there being any coercion. Again, I see it. And, in some ways, it is a growing thing.

Heck, that's how the early church was with the ecclesia. (Granted, there were leaders that were appointed through apostolic succession, but I am explicitly not conflating those with any human governance, as that is a separate thing. IMO.)