Well, I get the feeling that most criminals come from lower social classes.
I don't have any statistics to show you, but I think that people who grow up with a roof over their head, enough to eat every day, a loving family, lots of leisure activities don't need to steal, kill or commit violent actions.

Yes, of course there might be some exceptions like those students killing other students, but those are exceptions.

And if social inequalities doesn't produce "predators", what does?
Lack of education (which is linked to social inequality)? Violent TV shows and/or games?