If everyone exercised their second amendment rights, it still wouldn't create a safer society, but instead continue the cycle of violence.
I personally wouldn't carry a gun because I am commanded not to do violence to any man. Gun isn't the best form of protection if you ask me.
As for James bringing several guns along with a bulletproof vest into the theater, it is always hard to understand the motives based on the thoughts of a loner or a small group that are left to themselves. These people are depressed and in turn, they commit acts of violence in their depression to create depression in others. These people do not know how to properly deal with their depression.
I remember very well the details of the Columbine High School massacre. This is because I was in high school at the time and my high school was about 25 minutes away from Columbine High School! The two killers [Eric Harris and Dylan Klebold] were loners and were left to themselves in which they conjured up the massacre plans in a basement of one of the boy's home.
Moral of both stories: if you are depressed, get help!
The media published the information about the hair color of James so hence, we have the right to mention this tidbit of information. This information is crucial to understand the underlying motives of James. It is now widely debated that James might have done what he did based on what he saw in previous Batman movies as there are references to old Batman scenes that James might have played out.