The players will declare the owners racist when they can no longer afford to pay the outrageous salaries.
There is no way the NFL organization and owners can win.
If I complained / protested about some political or social issue on company time, unless my boss (owner) initiated the conversation, I'd be warned on 1st offense, fired the 2nd. Our customers are not paying for such activities. Nor will I, in your case. If your (NFL) employees want to beef on their own time, instead of game time, that's fine with me. But until that is the case, your product no longer interests me.
I have no desire to listen to / watch a bunch of overpaid dweebs who probably don't even know the statistics of who is killing whom. If I want to view a game, I probably just want to watch a game.
"Just play ball."