Nike know that black culture sells. as has been pointed out already, the majority of high profile nike sponsored athletes are black.
Not only that but Nike's primary target audience is no doubt the under 25s, whose favourite music is rap.
jayzee, 50cent, drake, rhianna, eminem, stormzy...all black and all wear Nike sportswear.
So of course Nike wants to position itself on the right side of the civil rights debate
But wtf do Nike know about promoting their brand? Fkin idiots for not checking first with the crusty old white racists of get big, before making such a monumental marketing blunder.