It's coherent and plausible: http://www.indybay.org/newsitems/2013/02/07/18731591.php. It looks like he turned against the force because they cover up brutality.

The saga continues (Feb 12). The media say he's killed another ex-colleague, and is holed up in a cabin in the San Bernadino mountains, which are having a real winter this year. You might expect Los Angeles Indymedia to say a lot, but all they've managed is this:

http://la.indymedia.org/news/2013/02/258314.php

This is much better. An old cliché finds another application:

http://www.counterpunch.org/2013/02/11/lapd-chickens-come-home-to-roost

The above article is written by a stripper. From Wales. 

Another leftist cliché is applied to the Dorner case - 'blowback':

http://www.counterpunch.org/2013/02/08/american-blowback

Another brilliant article in Counterpunch:

http://www.counterpunch.org/2013/02/13/the-execution-of-christopher-dorner

I suspect brutality is much more of an issue than racism.

http://www.reuters.com/article/2013/02/14/us-usa-california-cop-idUSBRE91A11B20130214

Officials have admitted "tear gas may have inflamed cabin". At the time of the Waco massacre, in Texas in 1993, in which seventy-six people died, politicians said the FBI and the BATF firing tear gas into the "compound" could not have caused the fire - the inhabitants must have started it themselves.