Over 90% of blacks vote for Obama. By pissing off white people, Does Obama think that he is going to win based on an issue where the numbers do not add up?
If Obama loses, he blames race, SCOTUS and George Bush. And then what? He will be spending NOvember thru January shredding everything.
Obama knows he can't "survive" a fall from power. Whatever he has been hiding successfully since his nomination is bound to escape if the Republicans take office. It's not just a matter of being shuffled off to write (Ha!) his memoirs or a third "autobiography". The best he can look forward to is life in exile.
That being the case, I think he considers it a matter of "if they take me down, I'll take the entire country down with me". That's the subcontext these riots are meant to impress upon his foes. He wants everyone to know he can indeed launch a race war if he wants to -- and the media will cheer him on.