I wish we knew why a sweet, gentle follower of the Religion of Peace would do this. Investigators seem to be clueless when it comes to his motive, and they may never find a convincing bit of evidence to answer that question.
Well, there are the stock answers: Racism, Homophobia, Islamaphobia, America,Guns.
It is always the fault of America, some way or another.
He did not have his Al Queda membership card in his wallet, so it cannot be an act of terrorism or sudden Jihad syndrome...
Yep, they are clueless. I am about 200% sure he is now feeling the fires of Hell. Hope he enjoys it, cuz it will NEVER end. What a clod.