I don't know if the President or Ms Napalitano knew of this on the day of the shooting, but it is a pdf file of a Homeland Security report on "security priorities for the next administration." Scroll down to page 29 on the left for Hasan's name. Link
If Hasan was involved with Homeland during the Presidential transition period, and later turns up to be a killer himself, I'd say Homeland has a problem.
So evidently, fear of being called racist non-pc xenophobes by the leftwing crowd caused Hasan's colleagues to stand down on reporting him to HS?