The black ghetto riots that happened from 1964 to 1968 turned the United States into a Republican country, and elected Nixon, who prolonged the War in Vietnam until 1975.
If I have time I evaluate blacks using the same mild criteria I use when I evaluate whites. I have known quite a few blacks who were far better people than you are.
Nevertheless, I have learned to take precautions with a group of young black men I do not know that I have learned are not necessary with white, Oriental, or even Hispanic young men.