When you mention Hitler, it's hard not to think of the evolution of the hatred of the Jews provoked prior to 1939. Germany was left poor to the point of ruin after WW1. When Hitler looked for a scapegoat in his rise to power in the 1930's, Jews were a natural choice, being successful in business with a dominant position in society as a minority.
Anti-Semetism wasn't an event, but a progression. Jewish business was the initial target, and it was successful because of the poverty of ordinary Germans. It didn't take long before the business part of Jew-hate fell away, to become a general hatred of Jews. 
I think the highly charged incitement of emotions about WMC are for political gain and take advantage of the same structural poverty. The gap between WMC hatred, and a general hatred of whites is not very large and groups like the BLF are trying to close that gap. Of course, there are white racists a-plenty, but the fires fuelled by BP and others will take years to recover from, if ever.