Or he could help others in "his" community understand that they too can have the same opportunity in this country to gain wealth by using himself as an example.
Actually, this makes me very uncomfortable... not every young black man can become a pro football player, though too many do waste their life and ruin their health trying. A few "make it". Many more are exploited, injured, and abandoned. It's much the same forces of poverty and limited opportunity and lack of education that forces many individuals into the military. When you have no other options, where do you go?
Football is not the answer to poverty, education is. And so, you'd think the whole college athletics scholarship system might be a perfect solution to the problem. In exchange for your athletic efforts on our school's behalf, we'll pay for your education. But it doesn't work like that! College athletes are even more exploited than pro athletes, and they almost never get any kind of education out of the experience either.
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Edit: Do be careful clicking on the link below. John Oliver has a bit of a potty mouth and they don't bleep him very well. It's still worth watching, though!)
Kaepernick holding up himself as an example to other young black men would be like saying, "You too can be a multimillionaire if you spend every last dollar on lottery tickets! I did, and I won! You can win, too!" I suspect he knows that, too.
Neil DeGrasse Tyson (arguably a much more successful black man than Colin Kaepernick) has talked about the obstacles that stand in the way of black men in the sciences. Teachers saying to him, "Science? Don't you want to be an athlete?" He talks about the road blocks in his way, and how his passion inspired him to overcome them... and then he talks about looking behind and wondering how much blood is on the tracks, that he made it when so many didn't. He doesn't say, "I succeeded, so what's wrong with you?" He says we need to remove those obstacles and level the playing field.
And he's absolutely right. He's not an example of how "they too can have the same opportunity in this country", he's an example of how unfairly the system is stacked against one segment of the population.