In the final scene of “Chinatown,” the noir movie version of Los Angeles’s original water grab, anti-hero Jack Nicholson confronts the brutal triumph of the film’s “pillar of the establishment” villain. The cops don’t want to hear his story.  They invoke the racist trope that the law of the jungle rules in the ethnic enclave where the scene occurs: “Forget it, Jake, it’s Chinatown.” The real life water wars continue, however, and it remains to be seen who will win the current power struggle at the Metropolitan Water District.