When your legal system gives the benefit to the police about NOT knowing the law and to everyone else that not knowing the law is no excuse and when your legal system does not apply the same penalties to the police for infractions of the law as to the citizens (slap on wrist to police, throw citizen into prison for long periods of time for the same offence) then you have a problem.

For the USA, there is an endemic problem with all law enforcement and there is various serious documentation about this. That is not to say that the USA is the worst, there are many other countries that have a much more deadly situation. However, for a country that is supposed to be the leaders of the free world, it is rapidly getting the reputation of being third world in this matter.

When other countries warn their citizens not to have interactions with any US law enforcement then you should realise that there is a serious problem in the USA.