[L'ennemi.]

NOt exactly.
but you did not come up with a better alternative to prison, except in the end with the "transported by the frontiers of civilized society.
I do get that you suggested a lot of other punishments or ways to establish justice. I don't want to discuss it , they might be better, I just don't care.
But in the end, you'll get some antisocials individuals who won't be dettered by your measures, and what do you do with those?
Prison or transported to the frontiers of civilized society.
Ok, since you argued that we can imagine a society without prison, tell me how the second example would work, and it what way it would be better than prison.
You've stated in this thread that you don't know, they'll might end up being prison anyway. I argue that it is certain. Unless we agree to simpky kill a large numbers of criminals.
And since you like efficiency, it's highly likely that they would be a standardization of punishment as it would be cost efficient and most criminals would end up in a prison.