My impression has been the same of the small number of black African immigrants I’ve met (mostly from Nigeria - IIRC). They were good people and far better educated than most Americans.
I was sad about what happened to one man, though: He bought the abandoned house connected to a house where I was renting. He started fixing it up to rent it out. He was so excited about his investment... until the locals started breaking in, stealing everything, and vandalizing the place. So, every day, he would work on the property, only to find the place trashed by the next morning.
Wow; that is truly a sad and frustrating story.