This actually makes complete sense to me. He was planning to off himself anyway, but it probably never crossed his mind that anyone might even consider fighting back. The way it played out in his mind, I imagine, is that he would blaze through the mall gunning people down, then commit suicide at the end of his spree. It was never, ever, ever in the plan to be taken out by someone else. So seeing that that was a possibility, he probably decided that it was better to prematurely end his spree as planned rather than become a victim himself and give up his power.
I'm actually really disturbed that I have this level of understanding of the shooter's thoughts and motives, but I'm pretty sure I'm on target.

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