In your experience, were child killers persecuted by other prisoners?
Not in the prisons I worked in. Today, most inmates don't care what you're doing time for. It's more about asserting power over the weaker inmates, and that is mostly done to get the extorted inmate to have them send money to their inmate account to use at the commissary. Inmates will push up on other inmates when they get a package, forcing the weaker inmate to give him all, or most of the package which would consist of food items. When I was working, extortion was the biggest problem, and inmates stealing things from other inmates.
They were still using cassette players back then, and when an inmate got one through the package room, it was engraved with his ID number. But it was nothing for someone to steal it and scrape the number off. The parts of stolen cassette players, were often used to make prison tattoo pens. They'd take the motor out and battery connection, attach it to the shell of a ballpoint pen, get a needle somewhere, or make one from a left over part, connect the whole thing together, so it would work like an electric tattoo pen...with the motor powering the needle up and down to puncture the skin to get the ink into the skin.