IIRC some days don't have a school shooting. Not sure about weeks or months though.

Sure it sounds bad when you point out that it happens almost every day. But, that is just an average over the span of a year.

When you really look at it and realize that most schools in the US are closed for at least a month's worth of holidays, 3 months for summer vacation, and of course 2 days out of every week. Well, then you will see that it's really much much worse than you originally thought.