When the good guys with guns are killed by the bad guy with a gun

Yesterday, Wayne LaPierre, the vice president of the NRA, said that "The only thing that stops a bad guy with a gun is a good guy with a gun."

David Gogian and Jeff Atherly were both armed, but they were both killed by a man with a gun. The mere possession of a gun, even wielded by someone who is trained in how to use it in a dangerous situation, is not a guarantee that the "bad guy" will be stopped. The suspect in that case fled and was subsequently killed in a shootout with police on the Monday after the officers were killed.