I agree with some of your points, but I would like to point out that he wanted to coach at Florida State but they didn’t want to hire him at the time. He took the Jackson State job because not many PWI’s were willing to just let him be the head coach of their institution without prior experience at that level.
He did help Jackson State a lot, but he definitely used that school to spring board him and his son to a “better” (in his eyes) situation. I personally have no problem with anyone getting an opportunity that they deem is better and taking it.
I do think it’s sad that more black people don't try and help build the HBCU’s up. The donor list for PWI’s is massive and riddled with wealthy individuals. Just imagine how nicer these HBCU’s would be if 20% of black pro athletes, not even the doctors, lawyers, etc.. went to HBCU’s and actually donated to this schools once they got their deals.
I know it’s not fair to put that much weight on kids and average to poor families trying to do what’s best for themselves, but man one can dream.