It's pretty common to lump the DC Snipers as "Islamofascist terrorists", but they never exhibited a political intent, either.
Good point, while it was never proven in court the prosecutors and many police thought his eventual target was John Allen Muhammad's ex-wife, who lived in the DC area. A perfect example of a motivation no one thought of until later.
Still way to early to know this guy's motivation, that is why we have police and the FBI to find that kind of stuff out and not internet forums.