My dad was a school principal, back in the good old days when paddles were still in every classroom, homework was a daily thing, teachers were generally worth respect for their knowledge of their subject, and kids were failed without regards for their self-esteem...
Anyways, my dad told me early on that the playground justice system was usually far more effective that his intervention. If Billy the Bully gets taken to the office and gets paddled, or some other punishment, he's going back to the playground looking for payback, and things will get worse. If Billy the Bully gets dropped to his knees by little Sally when she pulls her ponytail one last time, only then to learn that her after-school classes aren't ballet but karate, and she knocks the wind out of him with one quick, short punch, then Billy will no longer torment Sally. Word will spread quickly, and soon Billy the Bully is out of business.
Oh, and on doli incapax, in Ohio at least, that generally applies in civil matters, but not necessarily in criminal/delinquent matters. That is usually left to the prosecutor. When I was a prosecutor, we generally declined charges on 10 and under, but occassionally referred concerning cases to a court diversion program for services or counseling without charges.
