We understood Obama's motive before the November elections -- get the black voter bloc fired up enough to go to the polls in a non-presidential election. Whether it worked or not, it wasn't enough to save many Democrats.
And after the election, instead of telling the agitators in Ferguson to give it up and go home, he told them to "stay the course." So when the grand jury decision was made public the rioters and looters hit the streets, hard. All poor Dr. Frankenstein could do was watch it on TV, safe and sound in the White House.
It was a split-screen spectacle, the president of the United States appealing for calm while Ferguson was starting to erupt in flames.
As Obama was saying “there is inevitably going to be some negative reaction, and it will make for good TV,” the images of tear gas and looting were competing for attention.
I don’t know that anything the president said at that point could have deterred the protestors and agitators after no indictment was returned, and here’s why: They were reacting to a media narrative that hardened into cement soon after the tragedy. And we now know that narrative was filled with misinformation.
President Obama is a community organizer first and foremost. The next thing we know he'll be sending teams to Ferguson to help the looters set up their new big screen TVs.
Update: An alternate explanation from Instapundit:
Obama is the champion of the urban-black wing of the party, and because of him that wing has been on top. But his star is fading, black voters are beginning to realize that they haven’t benefited economically, and the next Dem nominee — whether it’s Hillary Clinton, Jim Webb, or Elizabeth Warren — will be from the white gentry-liberal wing of the Democratic Party. The riots, the marches, the traffic-blocking are a way of telling them that the Sharpton wing is still a force to be reckoned with, and to improve its bargaining power between now and 2016. At least, that’s the only way this — not at all spontaneous — street theater makes sense.
Highly plausible. Dr. Frankenstein is the Democrat voter, and the monster is Obama.