Given the shear monstrosity of the act, the repercussions thereof, and black eye his alleged actions have given military personnel.
I'm not all that inclined to disagree.
It was a monstrous act. He if suffering from a mental illness will be hard pressed to prove and use this as a viable defense in a US Court of Law. Insanity is a difficult defense in the US - Canada is much different on this.
There have been to many of these crimes and all Soldiers are tarred with the same brush.