To the casual fan, like the one in that Youtube argument, the lack of whites in starting spots proves their lack of athleticism, but if they aren't allowed to compete, how can they show they are viable? The ultimate trump card in their minds that seems to pop up time and time again: "Teams want to win, they would not discriminate because it would hurt their chances to win."
I think a direct answer to that argument should be offered more readily. If they cannot fall back on that assumption, they will be more ready to see the truth.
The fact is, professional leagues are not about athletic excellence, they are about making money! The fact is, teams don't have to win to make money. Most money comes from marketing and from league-wide revenue sharing. [We see this in every pro league: groups of perennial winners and groups of perennial losers and rarely the twain shall meet.]
Thus, pro leagues become closed shops, with only internal feedback, where they manipulate the rules to create a product that sells. The image of the savage angry black sells, for whatever reason, so we get more of it. [Need we look any further than how CBS tried to foist Kimbo Slice on us? The Vick phenomenon is similar in the NFL.]
The pro league that is in the worst state of degradation, through the elevation of marketing over athletic excellence, is the NBA.It is being exposed by the rise of international basketball, but the NFL has no such external competition to expose it.
Especially given the fact that college football is the only feeder system for the NFL. Colleges have their own incentive to reserve scholarships for blacks, related to affirmative action and "diversity" quotas.
Thus, the NFL becomes the tightest of closed shops, because there is no external competition and the feeder system has its own logic of discrimination.
Now, how to boil that down to soundbite length???