School shooters (let's be precise, as that is what people are talking about when talking about mass shootings, not gang violence or other stuff) want to look cool, and ARs are cool looking and everyone markets them up on both sides.
Which is why my simple modification to solve it all is mandate that all firearms be hot pink with a hello kitty logo.
Which is why my simple modification to solve it all is mandate that all firearms be hot pink with a hello kitty logo.