My partner is in prison and this is 100% true. The guards are the ones committing the worst violence. They're also instigating and constantly trying to anger inmates so as to have excuses to punish them. Currently my partner has had his cell raided and his personal belongings destroyed multiple times, for no reason. There was no contraband. They rip up artworks, photographs, anything precious. To try to make the inmate angry enough to snap so they can punish them further. It's evil.