Dallas tragedy proves a good guy with a gun shouldn't be the only thing that stops a bad guy with a gun

"The only thing that stops a bad guy with a gun is a good guy with a gun." Well, that gun lobby rubbish was again disproved in Dallas. Twelve good guys -- law enforcement men and women trained to shoot -- were stopped by one bad guy. Five officers were killed and seven wounded. Two civilians also were injured before the bad guy was finally stopped by a bomb-carrying robot.