It's just a defense mechanism. Life is a bit easier when you effectively ignore many of the injustices that are going on right under your nose when they dont directly affect you. And when they do see these injustices, they are conditioned to instead of being outraged, say "Well, what did he/she do to deserve it?"
There is video evidence of a man that has been tazed and subdued, and the cop still found it necessary to pump 6 bullets into him. And there are still people out here saying "We don't know what happened before the tape was rolling.". Like there is ANYTHING that could have happened before that would justify 6 bullets AFTER he'd been subdued. Many white people simply refuse to view America for what it really is, and I'll leave you to determine that because everyone in here already knows how I feel.