That's very worrying, I hope everything turns out ok at your son's school.
I agree that we should see these types of events happening in other countries if it were a worldwide phenomena but we don't. We do see terrorist attacks though but not the mass shootings every few months. It really does make you thin that something is behind a lot of these shootings. I totally agree that the US gov wishes to tighten it's control over the general population by any means necessary.