I don't know for sure about the area in which this shooting took place, but is it reasonable to assume that it's in a restricted-access area? And if so .... wouldn't soldiers posted at Ft. Hood be a pretty reasonable suspicion?
Not saying that's what actually happened -- I have no idea. But it's not an "OUTRAGE" to as you so adamantly suggest.
The outrage is the instant assumption by the old media talking heads that US soldiers are damaged goods who are just waiting to snap and open fire on somebody. This has been part of the leftist anti-military template for decades. It was, and is a vicious lie.