Criminals shouldn't be the only armed people in the world. If gun control advocates had succeeded in eviscerating the Second Amendment, this robbery would likely have succeeded and who knows what else might have happened.
It is also fortunate that neither Harbin nor his fellow robber was smart enough to determine what kind of bar they intended to victimize . . . the bar, Pooh's Corner, just happens to be a hangout for off-duty and retired police officers, like the unnamed bartender hero.