I'll start by saying anyone who have it a low score for abusing children obviously doesn't understand the premise of the show. It's to teach kids what their possible future is of wanting to be a bad***. Some say the yelling, violence, are overboard and not realistic. True, maybe not every single person in jail is like that. But a good majority are.
And if you pretend your a tough guy and end up in jail, some of the actual tough guys will do what they want with you. Stealing your shoes, clothes, beating you, even raping you.... this is jail life. Most of the kids that broke down are the exact type of person an inmate will target if they actually end up in jail. That's not a guess, its fact.
As for corrupt cops in the show. No, it's called a show. The parents sign a waiver that says their child will be exposed to frightening things. Obviously only to a certain degree. Again, its to instill a fear of jail so they straighten up. Plenty of times the cops have boundaries with what the inmates can do. Most programs the kids go into a jail is about 1-2 hours real world time. The interaction with inmates is just a part of it.
If only one child per episode changes, then the program did its job. If you feel offended by the show then you missed the whole point. Now I will say that I think there are better options of course to change a teens behavior. But this would be more of a last resort option. And many parents have said it was indeed the only option left.