As a Foreign Reader, it really pains me to read that there exists parents in other countries (maybe mostly USA?) that worry about whether their kid will one day become a School-Shooter. :(
Its only recently that we started to frown upon genocide. The atrocities committed in the Middle Ages aren't fresh enough. Mind you, its not "just the numbers". Here's a US example [1]. Or think about stories in the bible about the ill.
Sorry for the gallows humor...not sorry.