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For me, one of the big lessons here is that people still do not realize that domestic violence IS dangerous violence. "JUST" killing your girlfriend and her new boyfriend (or whatever authorities thought was going on in the first shooting) IS an indicator that you are an unstable, dangerous, and deranged individual. There should have been every reason to worry that such a person loose on your campus could potentially create more havoc.
Still, you really can't place so much blame on the university administration, they were probably all so shocked that they were doing doing the best they could in an awful situation.