A lot of it begins with putting the kids of poor parents into foster care. That's how authorities inspire hatred, anger, frustration and feelings of worthlessness. It's the 'I don't give a fuck zone', and with only a few months of that, most kids are pretty much destroyed. They are 'criminalized' when their behavior crosses over the almost unavoidable line of criminal behavior. We've made criminal behavior that wasn't criminal ten years ago.
All kids commit crimes.
Most adults commit crimes. The point is not that youth is criminalized, but that only certain kids are criminalized, and these are kids from bad neighborhoods. Take civil commitment. Used to be the wisdom was you can't predict criminal behavior. Now the wisdom is that a criminal is someone who committed a crime.