Sports of The Times: Was It a One-Day Revolt in the N.F.L., or Something More?

“I’m not going to do it again next week,” Penn said. “I didn’t want to do it this week. This all had to do with President Trump’s comments. That’s the only reason that we did that.”

Kenneth Shropshire, who runs the Global Sport Institute at Arizona State University, is the author of the 1998 book, “In Black and White: Race and Sports in America.” He has some interesting thoughts on the effectiveness of protest movements, and he worries that the N.F.L. movement might be fleeting.

To affect real change, Shropshire told me, the demonstrations can’t disappear in a flash. But their staying power depends on the reason the players and owners were spurred to action.

“At the player level, it really was someone saying on the street, ‘Yo mama,’ ” he said….

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