Surprisingly I actually do know a lot of cops. They do use the language you're talking about, they view non-cops as too weak and cowardly to do what is "necessary," the violence that they do. They also tend to be fairly unsophisticated sure but they understand what they're part of. And plenty of them are smart, and those tend to be officers in my experience.

But I simply reject the premise that any of this is caused by lack of education and can be corrected by shifting the selection criteria. You need a certain amount of moral flexibility and malice to stay a cop for long, and that will be just as true of college graduates. Policing attracts all kinds of people as it is, but it only retains the ones it can mold into a particular nasty usefulness.