Everyone has to be taught discipline, self control and right from wrong. They learn it at 5 from their parents or they risk get it beaten into them by society 10 to 20 years later.
Who would you rather have teaching you, your parents or police?
I would have 100% support for the modern way of teaching children to behave if juvenile crime was dropping or even stable. It's rising and the way to improve it is to carry on using methods that do not work.
