This comes down to whites being sensitive about the preservation of their race. Thats why they dont mind if almost 99% of cinemas have the main stars as white actors. A white man cant play a black character if his skin and culture has ties to the character and vice versa. The story can always be changed. There can be a black batman if need be. Batman's grandson might be mixed. Its the real world not some white fantasy that White America wants and believe in.