Was Christianity Today's Mark Galli right about the Colorado shooting? And is the post-Aurora massacre debate a replay of the faith-or-works argument?

(RNS) A Catholic priest has suggested that Satan may have driven accused killer James Holmes to open fire at a Colorado cinema, continuing the religious debate over a shooting that claimed 12 lives and wounded 58 more. By David Gibson.

As I kept watching my own emotions come and go, I wondered: 
what am I experiencing as I see the first live images of this killer?
What goes through my own heart?
Is it Anger?
Is it Pity?
Is it Compassion?

"Jesus was crystal clear on the question of whether violence is an acceptable response to violence, on whether arming ourselves with fists or swords or guns is the way to protect ourselves from fists and swords and guns." So says Ellen Painter Dollar today in response to the horrific deaths of twelve people. Why are American Christians so slow to question our society's knee-jerk protections of the right to bear arms?