Cho, for example, had been judged an "imminent danger" to himself and others by a state court but was still able to legally purchase a gun from Thompson's company.
Pam Hodermann, University of Wisconsin-Milwaukee's chief of police, said the focus should be on preventing troubled students from ever resorting to violence.
"I don't think you can stop it in any way other than stopping it in the mind of the person who does it," she said. " . . . I don't think having other students carry guns is the real answer."
Thompson said he's gotten hateful e-mails threatening to harm his wife and children. The notes anger him, but they haven't changed his mind about whether he's to blame.
"No, I didn't feel any personal responsibility," Thompson said. "Both of these murderers, they were able to get their weapons legally. They were able to pass background checks."
Copyright (c) 2008, Milwaukee Journal Sentinel Distributed by McClatchy-Tribune Information Services.