For most guys it’s entirely possible to go to prison without getting their butthole destroyed, if that’s not their thing. From what I’ve been told, there are plenty of willing partners in most prisons, so unless you’re a truly weak and vulnerable person, provided you follow the unwritten rules and don’t do anything super fucking stupid, you’ll probably be fine.

It sucks that the weak (often mentally ill or intellectually disabled and so forth) get victimized in US prisons, but the inhumanity of housing such vulnerable people with known predators is by design and is a feature not a bug.