|Pravda couldn't have said it better
There are many reasons for such clear and naked bias: agendas, propaganda, collusion with political and social movements. There is also a more forgivable reason. We all know the old saying 'if a dog bites a man it's not news, but if a man bites a dog it's news.' That's true. But say you are educated by a system, and subsequently become employed in an industry, that universally accepts the idea that 'men shouldn't bite dogs' is simply an age old bigoted notion imposed on the world by centuries of caninephobia. You are now part of a system that believes, whether for convenience or sincere belief, that men biting dogs is the most natural thing in the world. Won't that logically skew how you will see what is and isn't news?
It's also interesting that when we look back at racism in America's history, what do we look at? Inevitably we look at school lessons, movies and theater, newspaper articles and advertisements, and even early radio shows. If those things were so about promoting racism in those days, what miraculous sanctification do we believe they went through to have put such errors behind them, and now that they're obsessing with the original sin of whiteness, and the inherent evil of the Christian West and its bastard child America, they are any more credible? Apart from the dogma of Progress, I can't think of a reason not to be suspicious of these messengers whose forebears were the promoters of so much of what we condemn today.
Nonetheless, in centuries to come, I think historians will look back on the last century and a half or so and admit the disastrous impact that mass media, mass communications and nationalized education had on the horrors and terrors that we all so roundly condemn.