"Yep, and they're still breathing."
That's easy to do if nobody is threatening you.
Consider this: a nut with a gun is shooting at people. You and I are in different parts of the store. Both draw our concealed handguns and start looking for the nut. You emerge from menswear with a gun. I don't know if you're a good guy or bad. All I see is someone with a gun. BOOM! You're down and the nut is still wandering around.
I'm not a gun-grabber. I've owned a few myself. I'm also not a lib/dem. Does that spoil your quick-draw stereotyping?