Its true. Hollywood is the white liberal guilt capital of the world. its usually a white director that will make a minor character that was white to black(i.e. Perry White in The Man of Steel). Its a way to make them feel better about themselves and also to say "hey see we believe in diversity". Unfortunately clueless directors who aren't fans of comics would already know there is a plethora of great black character waiting to be fleshed out on screen. Instead of changing anothers work why don't they use existing characters?
Its usually the white liberal guilt people that think there is nothing wrong with changing established white characters to black but everything wrong with changing established black characters to white. Double standard to be sure.
And what is the source of this "truth"? Have you done extensive studies? Been to a lot of casting meeting in Hollywood? Telepathically scanned the minds of everyone in Hollywood?
I don't know about you, but if I can get Edris Elba or Laurence Fishburne in my film, I'm jumping at the chance. Because they're
Edris Elba and
Laurence Fishburne! I'm not waiting for a "black role" to come along.