Because, very sadly, it is now an epidemic in the US that has no workable solution in sight because of intransigence around a 233 year old constitutional amendm

Because, very sadly, it is now an epidemic in the US that has no workable solution in sight because of intransigence around a 233 year old constitutional amendment in a context of intense, media-led paranoia (perhaps creating a feedback loop). "Bowling for Columbine" is 22 years old now - I don't think there's been substantial progress any of the root causes Moore called out back then.