As an army psychiatrist treating soldiers returning from Iraq and Afghanistan, Major Nidal Malik Hasan had a front row seat on the brutal toll of war. It is too early to know exactly what may have triggered his murderous shooting rampage Thursday at Fort Hood Hasan is accused of killing 12 people and wounding 32 others before he was wounded by a police officer but it is not uncommon for therapists treating soldiers with Post Trumatic Stress Disorder to be swept up in a patient’s displays of war-related paranoia, helplessness and fury.