I have always told people that you will get a lesson in civics when riding the bus and a study in society.
Try taking a bus or train which passes through a black neighborhood and see how the black passengers act in transit vs Asian, hispanic and white passengers.
Bernie Goetz did what he did for a darn good reason. Note that he was convicted of illegal possession of a firearm, NOT for shooting the black thugs that were attacking him.
I homeschooled my son. Once when he was about 10 years old he wanted to ride a bus. So, we drove to the Carlsbad Mall and caught the 302 bus from there to the Vista Transit station and back. Quite an eye opening experience for him. He never asked to ride the bus again.