Why does this only happen in the US (except for that one time in Norway)? What happens in the US that doesn't happen in any other country? I think a cause-and-effect/Freakonomics-type analysis will reveal that the root problem is way beyond gun control (and for the record, I think that having guns is stupid, so no, I'm not against gun control). Allegro mentioned "mental illness". There's mentally ill-people in other countries as well.

An alarming number of broken families in the US may be the root cause behind all of this?