Well, lessee: I seem to recall that the DUmbshit's conundrum is answered by the very example he used - the Gabriel Giffords shooting. The guy who brought down that scumbag was not a cop; he was an armed citizen, and his first takedown that morning was of another innocent bystander with a gun. Considering that the other armed bystander is still alive - and not suing - I think that the guy who took down Dumdik's pet lunatic showed the type of quick thinking and restraint that we Concealed Carry types train for in shoot/no shoot scenarios.
Fail again, DUmbass.