Plenty of human characteristics on a spectrum, including sex and race.
The op isnt really asking why race isnt actually fluid, but why race isnt societally fluid. Stakes too damn high.
> >But the societal rewards and punishment around race >identification makes the type of fluidity you're talking about >impossible. There will always be an ulterior motive, an >incentive, how ever so slight. There is no societal incentive >to identifying as a gender fluid person like there is wit >race.
Unless someone in here can argue against this^
------------------- 'Some have lives that haven't gone the way they planned, and some are trapped in situations they can't stand...'