[rustcleaner]

>But could you not plausibly define anyone who commits major crimes to be mental ill?

Yes, and it makes punishment in the manners we do it [US] frankly unconsciable for being torturous. What else do you call forcing a man to sit in a concrete and iron box for ten years involuntarily, if he would willingly expatriate instead? Imprisonment should become optional with expatriation. It is assinine that we take away passports from criminals; you should be wanting them to depart for good! Throwing a man in a box completely involuntarily and without any reachable alternative recourse except to wait it out, in lieu of just seizing all assets and kicking them out permanently if they so choose as the prison-alternative, is assuaging what internet trolls would call... your booty-blastedness for him giving you a really bad time.

[worthless-trash]

This will be interpreted as.

"Come to the US, commit crimes until you get caught, then leave instead of jail time".

This is not a deterrant.

[rustcleaner]

Does deterrance actually work? Show me someone in the US who doesn't know about jails. Also a secure border was assumed but not stated. This presumes social groups want to be exclusive and are choosey of membership.

[worthless-trash]

> Does deterrance actually work? Show me someone in the US who doesn't know about jails.

I don't know how to address this disconnection in logic. Do you assume that knowledge of a deterrent should create zero crimes ?

You are right though, maybe deterrence doesn't work and summary execution will be the only long term solution to prevent any possible reoffending. I for one welcome Judge Dredd-like overlords.