sp1814 - I agree completely.
I am willing to bet that if you asked every single law-abiding citizen - at the time they bought a gun - whether it was ever in their mind to shoot and kill another person, they would be shocked, and deny it vehemently.
I don't believe anyone who is sane buys a gun with the intention of hurting, much less killing anyone, but when the circumstances occur, that is exactly what happens - as you have ably illustrated.
The much trumpeted notion of 'protection' falsely presumes that everyone who has a gun is level headed, calm under pressure, and will be able to use the threat of their gun to win the situation.
But that is not the real world. Here, where we live, people panic, squeeze triggers as a reflex, black out, trip over ... the list is endless, and death or wounding is the result - always presuming that the innocent lives long enough to shoot their gun before being shot by the lunatic they have confronted - and that is far from a given.
Guns owned by people without a very good reason to own them, and appropriate training to use them, are always going to end in tragedy, and that is what has to be taught as the way forward.