It's not necessarily a problem of conscious bias on the part of the Academy members; they just happen to be something like 90+% white. People have an easier time connecting to films with characters like them, which means the Academy members are predisposed to select movies about white people.
Oh I completely understand why it is the way it is (in terms of race), but that doesn't make it less biased. For a set of awards that are supposed to be the crowning achievement in the movie industry, its sad that they can't get past race.
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I completely agree with both of you but I think that the composition of the "mainstream movies industry" (as opposed to low budget and independent movies industry) workforce is one of the causes for the bias in the nominations by the Academy and ultimately the cause for the bias in the composition itself of the Academy.
Actually on a second thought that could be a self sustaining feedback loop (lots of white people in the Academy --> lots of white people in big budget successfuk films --> lots of white people in the Acaemy --> ...) having evolved to the present steady state from an old fashioned white cinema tradition/business model.
It would be a great and a necessary experiment to find another steady state in the system introducing diversity in the Academy!