Is it the government stupid?
Their elected representatives are stupid?
The guns themselves are not smart enough?
Or the people?

I have studied in Florida and seldom saw a gun but that was a very long time ago. My local gas station attendant was shot dead by a deranged man with a handgun, but that was the only case in Alachua I can recall.

Other nations seem to limit assault weapons to Police, Army , Marines etc

Only other places we commonly see them in hands of civilians are failed states like Syria Lebanon, Libya etc