@Eorl,
Eorl you're not lumping all Muslims together are you?
Or is it all members of the military?
No one who is in the military and is deployed to Iraq or Afghanistan is being forced to kill anyone, and as far as Hasan goes, to my knowledge there are no Fighting Shrinks in the US Army. He was not going to see combat, let alone be forced to kill anyone.
Even assuming he had a remotely credible notion that he might be in a position where he might have to shoot and kill a fellow Muslim, a decision to embrace an identity of Muslim over American doesn't rationally lead to going on a murderous rampage at Ft Hood.
Still lots to learn, but no credible indication of his being so absolutely crazy that he saw no choice but to engage in a suicidal rampage rather than be forced to kill Muslims as an Army shrink "treating" the poor sods who actually are killing people.