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There are so many shootings, I when I first looked at this strip again after all these years, I was thinking it was David Barton who is a prominent anti-choice guy. But I just Googled "Barton shooting 1999" and found a Wikipedia page for Mark O. Barton who shot 25 people, killing 12 of them, in a stock brokerage in Atlanta. Seems he also killed his two children and his second wife and is a suspect in the killing of his first wife.
So, yeah, this guy was a real winner. He killed himself four days before I originally posted this strip. Obviously, this strip wasn't really meant to be directed at Barton, but anyone else thinking violence was a good way to deal with one's problems.