They would not have had to kill him. Once they saw muzzle flash all they would have had to do was shoot back.  59 dead 500+ wounded and not one round fired in the shooters direction.  Hey maybe your plan is to say OK Ms Criminal please don't break the law and buy/ steal/make a weapon and we will put "shoot me" stickers on our backs.    BTW  it was only 350 yards.  That is a 10 inch circle for any person with an M-16 even with no scope.  Darn easy shot.   Look at what european police carry to deal with this kind of problem. Look at a photo of an Israli policeman.  Those are high power weapons they carry and they are standard issue for large events or certain locations...  Point is no one could have shot back if they had to.  They were defenseless.   And depend on the law?  Took 72 minutes to break the door down.  That is longer than a flight to Vegas from Los Angeles.   The NRA has the right idea.  All you have to do is listen and think and you will see that.