It's not sadistic; it's neutral. Nature is the only guard. It's not poorly run; it's not run at all. This is nearly the very definition of exile, so I'm not sure where your confusion comes from. Perhaps you feel throwing them into a desert is inhumane? Fine, then fence off part of a jungle or plains with a river or something else more comfortable. Build some basic infrastructure if necessary.

> only even more sadistic

Remember Florence ADX.