The new thing about the Aurora shooting wasn’t the weaponry, but the armor:
What distinguished Holmes wasn’t his offense. It was his defense. At Columbine, Harris and Klebold did their damage in T-shirts and cargo pants. Cho and Loughner wore sweatshirts. Hasan was gunned down in his Army uniform.
Holmes’ outfit blew these jokers away. He wore a ballistic helmet, a ballistic vest, ballistic leggings, a throat protector, a groin protector, and tactical gloves. He was so well equipped that if anyone in that theater had tried what the National Rifle Association recommends—drawing a firearm to stop the carnage—that person would have been dead meat. Holmes didn’t just kill a dozen people. He killed the NRA’s answer to gun violence.
Essentially, Holmes has called the NRA’s bluff. It may be true that the best way to stop a bad guy with a gun is a good guy with a gun. But the best way to stop a good guy with a gun is a bad guy with body armor. And judging from Holmes’ vest receipt, he wasn’t even buying the serious stuff.
The NRA bases its good-guy approach on a well-substantiated military doctrine: deterrence. By arming myself with a weapon that can hurt you, I discourage you from attacking me. For many years, this doctrine averted war between the United States and the Soviet Union. Each side feared mutually assured destruction. What broke the deadlock wasn’t a weapon. It was a shield: strategic missile defense. The Soviets understood that a system capable of shooting down their nuclear missiles would, by removing their power to deter us, free us to attack. The best offense, it turns out, is a good defense.
That’s what Holmes figured out. Defense, not offense, is the next stage of the gun-violence arms race. Equipping citizens with concealed weapons doesn’t stop bad guys. It just pushes them to the next level. The next level is body armor. And unlike missile defense, which has proved to be complicated and disappointing, body armor is relatively simple.
EDITED TO ADD (8/2): Seems that the amount of body armor Holmes wore was exaggerated.