A man starts shooting in a crowded theater, what do you do?
Do you try to run and hide?
Do you reach for your handgun and fire back?
Do you wish you had a handgun so you could fire back?
Do you wait for your chance to jump the shooter and disarm them?
Will you now go out and buy a handgun?
Answer as you will. I listened to the author of a book about psychopaths who had very interesting comments on why these people do what they do. There simply is no easy answer to this insanity.