They go through sensativity training, and anger management training, and family counseling training, and Satanic ritual training and ....
you get the picture.
I honestly think the first idea of wanting to be a cop in a kid's mind is a sort of idealistic, "I'd never let THAT happen" ... or some such
After training, they come not being able to even touch their original thought process
Just my opinion
Sort of like Common Core, or public education in general; but with a different “product” in mind.