Imagine if "taking the knee and bowing one's head" actually "unites" the following people and groups in their "displeasure" with some aspect of the United States (for different reasons of course):
(1) Blacks because of police brutality/shootings.
(2) The Liberal Left because of their hatred of Trump.
(3) Southern Confederates because of the loss of the Confederate States.
(4) Religious Conservatives because of abortion, same-sex marriage, etc.
(5) Native Americans because of war, conquest, and broken treaties.
(6) Native Hawaiians because their sovereign nation was stolen from them.
(7) Any and every other person/group for other reasons.
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As anyone can see, there are lots of reasons for lots of people to "kneel on bended knee and bow one's head" if they choose to do so.....in a way that "traditionally" has been used to show one's reverence to God.