Actually, someone being interviewed yesterday said that this guy was disillusioned about the war but was sure it would be ended after the election.
When the election and inauguration came and went but there was no end to the war in sight, well, this guy became very unhappy.
Sounds like someone went berserk because they didn't get their pony.
The whole blame thing is so stupid. The guy is a lunatic, he did what lunatics do. Lunatics come in every race, religion, national origin, color, sex, age, sexual orientation, political party, and disability. They don't need a reason, if they don't have a reason they will make one. No one is to blame for what they do except them.