These events are:
2)Not uniquely American
3)Very often do not involve firearms
4)Claim the lives of about 15 kids a year, out of 15.8million, about 600 kids a year die in school transportation accidents
5)In other countries, the lunatics use knives and swords and kill just as many
6)In other countries, the lunatics use explosives and regularly kill far, far more.
The answer, to an attempted attack, is individuals being able to defend themselves. Even 4, 5, 10 children tragically killed in a firefight would be preferable to 20 waiting to be slaughtered in turn, yes?
The answer to intervening BEFORE an attack is far more complex.