A few years back, I had to give a lecture on automobile safety. Airbags had just been made standard equipment and it was a hot topic. I was doing some research to get my dates correct and I realized something which should have been obvious. From the early days of film and following into the television era, the scene of a car crashing over a cliff and bursting into flames was a very common cliche. The shot of the burning car was always followed by a cut to the hero, who was lying in the grass, after happily leaping from the car, before it went over the edge. This was the origin of "being thrown free" of an accident. It's just about as stupid an idea ever conceived, but that's the power of visual media.
How does a good guy with a gun in Wal-mart get shot in the back? Simple. He watched too much TV.
He failed to realize a fundamental fact about guns, which is, a gun is useless as a defensive weapon.
Our Wal-mart GGWG heard the BGWG fire a shot, so he responds and walks right past a BWWG to confront the BGWG. This was a serious mistake, because she shot him in the back. If he had more time, he might of had a better plan. We can analyze his tactics in the safety of our keyboard. His obvious mistake was letting the bad guy see him. Up to that point, the only thing BGWG had done was discharge a firearm in a public place, probably not even a felony. GGWG is lacking critical information, and in the meantime, gets shot in the back.
While you are correct as to how he died I disagree with the rest of it.
1) The BGWG's actions constitute a reasonable threat to everyone around. I would support him if he had simply shot the BGWG at that point.
2) Too much TV has nothing to do with failing to realize there are two bad guys. While confronting the BGWG was a bad course of action I don't see how it's based on TV.
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A little problem with your analysis: It certainly seems like that civilian who intervened was the cause of their crime wave falling apart. Yes, he got killed but he *DID* delay them enough the cops stopped them.
Ya, it's lucky he was there. Otherwise the cops wouldn't have been able to realize that they were in the Walmart with the more obscure clue of everyone running out while screaming that there were two people matching the description of the cop killers they were looking for firing off guns there.
Exactly what delay is it that you feel he caused?
He messed up whatever their plans were. They certainly didn't come there just to commit suicide.