It's like sweeping categorizations of an entire country are usually not accurate or something.
I don’t think it’s too far fetched to think that song was colored by their experiences with the notoriously corrupt LAPD of the 1980s.
Yes, this is so trivially true of any place that it's not worth mentioning, as generalizations are meant as just that: Something that a majority (or at least a large minority) are like. For example, people do say "people in the US speak English", even though there's a number of people that don't. This doesn't make the generalization any less useful than "Americans like baseball" or "Americans wear shoes around the house".
And, for anyone who isn't reading between the lines here, without a doubt I'm only so lucky as to avoid their attention today because I made it and have spent the last 2 decades living in nice neighborhoods and driving nice cars.