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I think there is forced diversity in Hollywood. However, I don't think it's entirely Hollywood's fault. AND, I don't think it's as bad as people think.
In the 80's there were TONS of films that came out that had few or no minorities in it. Many released movies inadvertently created stereotypes, when they weren't trying to stereotype. Media and public called foul, and the studios got slapped pretty hard with this. Better Off Dead has no black people in it, and has 2 Chinese brothers who drag race in a foreign car. The spoof at the time was that the type of foreign car was not what would be drag racing on the street. The stereotype didn't exist....until after the movie, and the studio was called out for this, and the fact that they didn't cast any black actors. Over the years it has slowly lessened.
Now this isn't entirely a bad thing. It did allow the writers, casting directors, and other departments to expand their views of lead actors. An old wizard doesn't have to be a man, or an evil witch doesn't have to be a woman. It can provide more creativity.
What bothers me is when a studio takes a story and uses the cast in a re-imagining, and people call it whitewashing. I have no issue with changing some of the cast around in Spider-Man. It was done well. I do feel that they departed the original feel of Spider-Man's origins, but they did it in a way that modernized it. I can't say I fully agree with all of their choices, but a few were actually believable. Ghost in the Shell, was accused of whitewashing, but the story was blended well for the fit of the character's storyline. I had other issues with the movie, but whitewashing was definitely not one of them. Foreign countries make American and European movies their own all the time. Many are blatant rip-offs. Bollywood is notorious for this. I can't remember the foreign title, (since it is in a foreign language I don't understand, and it's not a direct translation of the title) but there is an Indian movie that totally ripped off the story of Tom Sawyer. Injun Joe was some crazed China-man, and Huck was a Buddhist instead of Hindu which is why he was considered an outcast of his community.
The biggest reason why Hollywood is doing this is to meet the whining of the public and media. Maybe they are just trying to placate the masses. If they get the damn story right or believable, then I don't care. If it bombs, people are going to complain that it was because of the craptastic casting. If it becomes a smash hit, people will praise it for the re-imagining. Just enjoy it or dislike it on your own. It's not like you can trust many critics to give a fair review, anyway.