If someone is hell bent to kill a bunch of people he probably isnt going to be stopped. You dont have to like it, im not really very thrilled with it myself, its just the way it is. Being a sitting duck for someone isnt really a very good plan IMO, but if you choose not to defend yourself, thats your choice. Remember when seconds count, the police are minutes away. That may have made a little more sense 75 years ago than today.