Okay, just thinking out loud here, bear with me.
In one of the articles on DK I think it was said he bought the guns recently. Then he deliberately took them with him to the Madden event.
Did he intend early on to shoot the place up? Or was it a spur of the moment decision?
He probably went to the competition intending to win, so was his loss and the resulting murders not premeditated?
I'm not excusing DK and his deplorable choices, just wondering if it hadn't been the Madden tourny, would he have found some other place to shoot and kill?