
" I don't blame myself. You see, Mr Gittes, most people never have to face the fact that at the right time and right place, they're capable of anything. "
Noah Cross -
Chinatown
1974
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Sunday Dog Parade

Chinatown connotes color and in a larger sense the hidden twoness of things. It is both a place and a state of affairs, part of Los Angeles and Los Angeles itself. At the end, we learn that Noah Cross "owns the police", that the cover-up Gittes detested in Chinatown extends all over. To paraphrase Marlowe's Mephistopheles ; Why this is Chinatown, nor am i out of it.
except from
Norman Holland
A Sharper Focus