Karma or OOOPs?
Or bored prison guards that knew exactly who the two men were, and just wanted to see the resulting beating.
Perhaps they didn't anticipate murder, but they probably expected some trouble, and orchestrated it.
Do you truly believe they made an oops?
The other inmate told them he wanted a change of roommate and why, and they refused.
If it was an oops they would have seen the big problem here and changed it.
I guarantee you, it wasn't oops. The prison system knows exactly what it is doing.
Remember when Whitey Bulger just happened to be temporarily in a prison where there were a lot of gang members who hated Whitey.
Look what happened. Do you think that was an accident?
I can give you 20 more examples.
Sounds like a case of “Sorry, officers, he slipped on his bedsheet and hit his head on the floor about 20 times”.