I have noticed that people who thrive on corruption and everything that's not in line with the law, often sport the whitest of whites. Odd coincidence?
Just for a laugh, here are a few meanings listed at dictionary.com for the word white.
(Slang.) decent, honorable, or dependable: That's very white of you.
auspicious or fortunate.
morally pure; innocent.
without malice; harmless.