hypercrites

He was wearing bullet-proofing so even if every member of the audience was "carrying", that wouldn't have stopped him either. Given that he was at an exit, nobody was sitting near him either.

And yet something must be done. You're saying NOTHING can be done.

Something MUST be done.

Like closing gunshow loopholes and tracking every gun ever made, beginning with the manufacturers, so that transfer of ownership of illegal types of guns can be tracked to an illegal purchaser and removed from the purchaser immediately after purchase.  If cops can see whose auto insurance has expired right away, it's possible to see when any armament has transferred into unauthorized hands.

I will repeat:

1. License all guns like states do automobiles.

2. License all gun owners by testing for gun handling competency, like a driver's license.

3. Close all gun show loopholes and track every fire arm ever sold, including between private individuals.

4. Criminals are already denied rights to guns and voting, so criminality isn't the issue--the only offenses on the Aurora shooter's record were a couple of traffic tickets, so claiming that only criminals break laws with guns makes claim to a falsehood.

5. Laws against things don't prevent **** from happening, so the idea is to make such ideas become a bad idea even to those who would contemplate such things. 

Further, for every citizen to be "carrying", it is constitutional to defend against a personal attack against the carrier--but it remains UNconstitutional for any citizen to act as judge, jury, and executioner defending any other person, as this usurps the Due Process clause.