Doesn't the "if everyone had a gun, this wouldn't happen" argument only hold water if everyone is clear who the bad guy is? In the Navy yard shooting, once the bullets started to fly, how do you determine who is the good guy and who isnt? If everyone is draw and sneaking from cube to cube, who do you take aim at? The beauty of security guards is the uniform. Typically the guy in the jeans and sweatshirt with the gun is the bad guy. I understand the protect yourself concept and think it can work, but I don't think it as quite as cut and dry as the NRA makes it out to be. Arm everyone in the cubicles, fire 1 shot, and see who starts shooting who. In Iraq when the pot shot morter rounds came in, the biggest danger was the 18 year old PFC locking and loading looking to get his terrorist kill. I was much more afraid of him than the lucky mortar round.