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NFL Player Protests: Should NFL Players Stand or Kneel for the National Anthem?
Playing the national anthem at game openings is a choice made by the stadium and the franchise. No action should be dictated in response.
Each team should be allowed to decide if and how they might enforce the national league's stand-up policy. Players can add that factor into their decision when deciding what team to join.
Playing the national anthem isn't just a preference of the league, it is a custom that all professional sports recognize.
The business, stadium, or franchise is at liberty to take "action" that perhaps "should" be done. In other words, the action needn't be dictated by a third party. Furthermore, nobody is seems to be suggesting that other parties ought to intervene.
The NFL could make it a condition of employment to stand at attention when the host country's national anthem is played and flag is displayed. This is true in U.S.A., Canada, Mexico, U.K., etc.