We have an epidemic of hyperbole and demagoguery by activists fighting to end civil rights.
Acts of firing AR-15's into "large crowd of people at innocent gatherings or schools full of children" are extremely rare.
If you are going to be killed by a gun, it's almost certain to be 9mm. After that a .22, then .38. then .45. You know what they all have in common? They're handguns.
But facts don't matter to you, you want civil rights ended, and ended now.
They are not rare enough.