Please stay on point. The discussion was of police and the military shooting looters on sight, under orders from the governor or the president. Nobody was "taking the law into their own hands." It was a necessary measure to restore civil order, and the only responsible course of action.
There were some cases of building occupants shooting people attempting to break in. That was self-defense, an entirely different issue. Nobody objects to killing in self-defense.
You were the one with the fantasy of gettin' your gun and heading out to pot a few looters. The police and military would be justified in killing you too. In fact, that small armed group that the Army wiped out was probably a batch of nut cases like you. What skin color do you think they were?