What's wrong about it? I can support my perspective: actions do indeed have consequences. To follow your technique, here's an example: If you mix one set of chemicals you get plastic. Another, it explodes in your face.
Casting white actors for black roles consistently has many negative consequences. For the self-worth of people, in varied ways. For black actors looking for work, as a more direct consequence. On the other hand, white actors do not face this struggle, because most roles are already designed for them, and they get offers for many that are not.
So this particular chemical compound blows up in black actors' faces. My reaction is to go with a different compound, until the rules of physics, err, society, rather, change how these chemicals behave when mixed a certain way.
Well, I've been asking why you follow a philosophy that ignores consequences. I think I got my answer.