Disagree, the independent variable is "are we allied with them," not "are they white." Just refer back to demonization of "The Hun" in WWI, baying for Russian (white in America) blood, "This film is dedicated to the brave Mujahideen fighters of Afghanistan" against the (white) USSR, etc. Of course we're not going to root for Iraq, Afghanistan, Palestine, and other countries we and our allies are bombing.

A propaganda system will consistently portray people abused in enemy states as worthy victims, whereas those treated with equal or greater severity by its own government or clients will be unworthy. The evidence of worth may be read from the extent and character of attention and indignation. We will show in this chapter that the U.S. mass media’s practical definitions of worth are political in the extreme and fit well the expectations of a propaganda model. While this differential treatment occurs on a large scale, the media, intellectuals, and public are able to remain unconscious of the fact and maintain a high moral and self-righteous tone. This is evidence of an extremely effective propaganda system.

- Manufacturing Consent