You dont refer to different species of bears as races.
Why do they do it for humans?
I don't know, I'm not an educated man. Differend breeds of cats like lions and Tigers for example can have healthy offsprings together, meaning they are the same specie the cat, but differend race. That's how I understand it.
When I was in school I was taught that being in the same specie is determined wether or not can healthy and functional offsprings be made. Like a negroe can have perfectly healthy offspring with a caucasian so it means even though they are of differend race they are the exact same specie.
But poltics, brainwashing/conditioning can be the reason why race is not allways acceptable when referring to humans.
And my english is trash along side with my knowledge in biology so I shouldn't even talk about this. I don't even believe in evolution, not because I'm a christian but because evolution has not been proven with facts, it's ony been given logical theories that could be possible but unlikely and that's what majority of population is taught to
believe, but I refuse to believe it.