Phil Lynott of Thin Lizzy considered himself "Irish", because he was raised in Dublin. He was once asked what it was like to be black and Irish. He replied - "Like a Pint of Guinness". It would certainly be cool to see a world where people of all kinds have access to pathways to follow their passions in life.
Unfortunately, none of us are going to race the Gran Prix in Monaco. None of us are going to be astronauts. None of us are going to get hired for million dollar salaries because our dad was the president of some country. That's just the nature of life. We all get the advantage of the starting point our parents have given us, and as we grow up, we reap some of the benefits of their powerful allies as well. People who group ME in the same class of privilege as the "Kennedy's" just because we both happen to be white skinned don't really understand what privilege means.
If some very wealthy black person wanted to field an IOM TT race team, all it would take is a LOT of money, but that person would have to be interested in motorcycle racing probably as his motivation... We are all mostly interested in things that we grow up with, and are exposed to during our youth. I was interested in a lot of different things as a kid, and was flat out told, "NO". Sometimes I was told, "That's only for rich people, and we're not rich". I think we are all subject to that situation, and it shapes our path in spite of our desire to "win the indy 500" or some other thing totally out of our purview.
Why aren't there more black people in the IOM? Probably because they aren't exposed to motorcycle racing enough as youngsters to get bitten by the race bug.