Very true.
Growing up I was far more scared of the police than anyone else in what was not a very nice area.
This wasn't cultural conditioning either.
It was the experience of being routinely stopped, questioned, accused, intimidated and occasionally humiliated by being made to partially disrobe. It makes for a terrible feeling of powerlessness when someone else can do whatever they want to you at any time and any effort to avoid much less rebuke the situation will only make it worse.
At least one friend of mine from that time is now a police officer. His experience has only confirmed the prevalence of this ugly "at war" mentality in in law enforcement.