This relatively "new phenomenon" where NFL players throughout the country (and some others) chose to "kneel" and perhaps "bow their heads" during the National Anthem could be a questionable expression of their "displeasure" to "contempt" for the United States and its Anthem.....and perhaps President Trump.
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And  it could be that some joined the "knelling" to also express their reverence for a much Higher Power (God) since "kneeling and bowing one's head" is a "traditional" way of showing such reverence to God.
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Think of the irony if Blacks, Southern Confederates, the Religious Right, and others all - all - become "united" in showing their "displeasure" of the United States.....for entirely different reasons.