What, Fisticuffs?

In perhaps the most unintuitive graphic I've ever displayed, it appears Belgian schoolchildren (of the French variety, moreover) are wont to throw down, while Americans and Germans are as docile as can be:

My primary and secondary education did not expose me to too many fights, either as observer or participant. This may be because that portion of my education was at a private religious school with strict codes of conduct, or it may be that in order to honor my name's etymology, I felt compelled continually to broker the peace.