Similarly, it is not "politicizing" to talk about increased regulation for the financial industry after the collapse of MF Global or, I don't know, the global financial system.
James Holmes was carrying a legally-purchased AR-15 assault rifle, with a drum magazine capable of holding 100 rounds. It can be reloaded in 2 seconds, and the bullets are capable of piercing two people at a time. According to witnesses, Holmes fired steadily and paused only when he needed to reload. The manufacture and import of AR 15s was banned in 1994, and at the same time, there were limits on the size of the drum magazines that could be attached. That ban expired eight years ago. Holmes began buying his guns and ammunition in May of this year.
It is not "politicizing" to observe that maybe, possibly, the body count would have been a little lower if James Holmes been restricted to purchasing an assault rifle that, say, was only capable of holding 50 rounds. Or prohibited from purchasing one at all.
You know what would be politicizing? If someone used the Colorado shooting to make some entirely unrelated point to advance a different agenda. That would be politicizing.