How do you slow down the rate of fire and reload, without causing someone trying to defend themselves a greater chance of failing? Even as common as they've been lately, the death toll is way too low to be screwing over responsible gun owners for it, who may protect themselves, their children, or even perfect strangers, with a semi-automatic pistol or rifle. And no, rate of reloads really doesn't matter. That's entirely your unwillingness to accept reality. Mass murders are against people without guns, themselves. Unable to meet the threat, the killer will be able to take his time reloading. We know this from postal incidents. We know this from Columbine. We know this from VT. We know this from Sandy Hook. Et cetera. P.S. see the um...well, I'd use a blink tag if I had it. The vast majority of these shooters stop, whether by up and stopping, or commuting suicide, as soon as someone that may be a threat shows up to the scene.