Children have a very pure, caring morality. In part, because the adults around them inculcate it, basic principles of fairness etc. are important. Few tell young children, it is just great to rip off those other kindergarten kids and make money and hit other kids to make them obey.

On the other hand, it is considered 'cool' by some, and a mark of individualistic non-conformity to have a bumper sticker proclaiming "My kid beat up you honor student"

"God bless the child that got his own....
That got his own....'

Interesting message in that rather old jazz "hymnal."

Well, I took those as a humorous response to the "My Kid is an Honor Student" business, which deserved to be lampooned, kind of like putting, "Star Fleet Academy" or, "School of Hard Knocks" stickers on your rear window.