To answer your last question, maybe this is the resultant of 250 years of slavery, followed by 100 years of constitutional segregation that only officially ended in the '50s and inequality that continued long after...
These American people had a very difficult life for a long time (350 years), and this could play a part in the rebellious attitude of some individuals.
If I was in their shoes, I would probably have a rebellious attitude.
I don't agree, I think it depends on their personal situation and corresponding mindset.
The persons that did well and made a good living for themselves and family don't have that "anger" unless indeed they are the victim of racism.
What could play a large role is the induced mindset from the parents. I had a mother that was put in a japanese camp in Indonesia in WW2 when she was 11 to 15 yrs old under harsh conditions. She was afraid of crowds and go to public places the rest of her life. That was induced to me and my brothers, it is well known as second generation camp syndrome. The jewish people that survived the concentration camps in WW2 had this in an even much severe way, I have been lucky to have known a man who survived Auschwitz and been to his funeral and heard his children speak awfull things and I realized that this was induced upbringing.
I can elaborate on that but for this topic it suffices to say that IMHO the situation of your parents while raising kids is very important in how these kids stand in life, and even then when they become adults they have to choose, do I want to be a victim and play that role or do I want to do everything I can to make it. If they choose the latter and are obstructed in those goals by real racist contra forces then they have all the right imo to complain and protest (as long as they do their best to keep it from their children
). And the latter, the real racism should be the topic and should be abolished. What happened in once family 200 years ago or 75 years ago is the past and you have the choice to (re-)live the past and hang in it or live for the future and try to do your best.
Just my 2 cents.
PS: I heard in some interviews that parents teach their children from young age to be very afraid of the police because they are evil and instruct them to comply.
What do you think that this results in ? How can there ever be a balanced trustworthy interaction when their mind is already so preprogrammed? This is probably very controversial because the parents want to protect their children by doing that but think about it what it teaches their children.