I think when this is investigated, they will have evidence to suggest that this was premeditated. He posted anti-military information on online boards. Additionally, fellow servicemembers have said that he talked about how he thought it was ok for American soldiers to be attacked over in Afghanistan and Iraq. Is it just a coincidence that this shooting took place in a facility where soldiers were gearin' up to deploy to Iraq/Afghanistan?
The Army CID had been watching this guy. You can't tell me that the teasing this man may have endured was enough to drive him to go on a shooting rampage. He is a professional officer and psychiatrist --- he is supposed to have superb coping mechanisms. And even if he didn't, he surely is the expert on where to go for help.
I am praying for the victims and their families.