"Forget it, Jake...

...it's Chinatown". Would somebody please explain this to me? Cause, it's not Chinatown at all,  it's the John Huston character causing all the trouble. "Chinatown" is possibly meant to symbolize a complex place in which Jake Gittes is an innocent/foreigner, but the phrase does not work as irony.  Are you simply meant to cross out "Chinatown" and substitute "Los Angeles"? What am I complaining about? It just seems that the defining phrase of the film doesn't actually contain any meaning, it just sounds wicked cool. But feel free to disagree with me.