Hey the anarchists stopped responding when security & courts were brought up, brilliant!
I didn't see that part because I stopped reading your post after I saw this:
Right now the model works well with societies of a few million people and societies of hundreds of millions of people.
If you think giving a small collective a monopoly on deadly force to intimidate, harass, imprison, and kill is a well working model, what more is there to say? You seem to think that just because we are proponents of anarchism, that all of us will have a definitive and concise solution to every possible scenario you throw our way. I'm still a student of anarchy so I'm not going to pretend I have all the answers. But the model you're a fan of will sentence a person to 55 years in prison for marijuana and in the same breath only give 10 for murder.
I guess we could always vote to try and change that...