Given the culture that surrounds prisoners, this isn’t surprising at all.
The prisons themselves are just for profit with zero interest in rehabilitation or otherwise turning those in their custody into productive members of society. Yes, there are programs to teach skills or education to prisoners available, but in almost all cases these are either operated by outside organizations and thus don’t cost the prison any money, or completing the program lets the prison take advantage of any certification or qualification earned, generating more revenue for the prison.
Prisons intentionally make people live in the lowest quality of life possible by law, and would reduce the conditions further to save money were there not laws to prevent that. They justify this because prisoners are being punished, even when that mentality is proven wrong time and time again, specifically in how wealthy or influential prisoners are allowed to make improvements to their own personal living conditions, rather than having to live like the general (poorer) population of the system.
Don’t ever fool yourself into thinking US prisoners care one bit about a prisoner’s security or safety, they would put all the prisoners into medicated comas and hang them up on meat racks if the law allowed it and it was cheaper than shoving them in cells. As long as they get paid for every day they hold a prisoner they don’t care about any other aspect that doesn’t cost them money to ignore. They only care about prisoners killing other prisoners because the state won’t pay them to hold a dead body.