They stand for what they believe in, even though it can play against them.
Look at what Nike did supporting Kaepernick potentially losing in sales and brand loyalty.
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In the 5th year of his professional career, Kaepernick began kneeling on the sideline at games during the national anthem to protest social injustice and police brutality.
First, he didn't get any attention. Then more player picked it up, and THAT guy said: