From what I read, and I unfortunately can't find that story right now, he was a practising Muslim. He disagreed with the war in Iraq and he got "picked on," I guess, for speaking out about it. He was going to be deployed to Iraq or Afghanistan and he really didn't want to go. He had asked to be discharged, but they were deploying him anyway.
He was to be deployed on Friday. He shot and killed a bunch of people on Thursday.
They aren't saying this is why he did it, but my guess would be that he did it because he didn't want to be deployed.
Here is a different story, not the one I read this morning. It would appear he did suffer some ugliness because of his religion. Not that it is any excuse, of course.
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Kurt Vonnegut (1922-2007) wrote:
I am eternally grateful.. for my knack of finding in great books, some of them very funny books, reason enough to feel honored to be alive, no matter what else might be going on.