Olddude, it's your turn. You have several times advocated having more armed people in every crowd. I think your idea is that if someone opens fire, they'd get taken down quicker. I have a very different expectation for that scenario. I'd like you to refute it if you can.

Crazy person with gun pulls it out and starts shooting in a crowded shopping mall. Armed Bystander #1 (AB1) sees it and pulls out his gun to take down the shooter. AB2 sees AB1 with a gun in his hand and tries to take him down. AB3 sees AB2 with a gun in his hand and tries to take him down. AB4 sees a whole bunch of people with guns and tries to take them all down. Pretty soon there's eight or ten people with guns blazing away at each other with hundreds of normal people in the cross fire. I could easily see the body count from "friendly" fire reaching 50 or more. Since they're not members of a militia, our armed "defenders" have no way of knowing which are the good guys and which are the bad. What's your proposal for ensuring that the Armed Bystanders are shooting in the right direction and that they don't hit anyone but the bad guy?