Permanently is doubtful, but managing to escape for a little while I can certainly see. The police did say he had made a plan to escape, so it might be possible he wanted to flee long enough to cause another shooting somewhere else. That would be a scary thought - a serial mass murderer. I bet a plot like that will get used for some trashy crime TV show like Criminal Minds.
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"My guns are the only things that haven't stabbed me in the back."
-Kip Kinkel