National Anthem singer takes knee at Brooklyn Nets game

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I've never thought kneeling during anthems is an especially appropriate way to express protest. The act seems sacrilegious -- isn't kneeling itself a sign of piety (kneeling during a prayer) or subservience (kneeling to monarch)?

Now, turning your back to the singer or the flag during the anthem would be a protest since turning your back to a speaker is immensely disrespectful in any context.