Just reviewed the thread you posted regarding the original "Dear Whiny White People". Think you're correct per the opening remarks, a large segment of white America doesn't want to be reminded of our National history of Slavery or following institutionally supported practices of Discrimination.
Those same "willfully ignorant" people seem to be following in the footsteps of the "Ayn Rand" crowd, take that same completely selfish perspective, don't want shared social responsibility for the welfare of anyone else.
Think I'll post the rest of my remarks here since they'd otherwise be lost in the general confusion.
From my Perspective
Many try to deflect ownership of that "National Slave Legacy" as you've mentioned, by methods that include comparative statements like "Our Ancestors had it nearly as bad". Minus the Generational Subjugation and Slavery, and following Discriminatory Practices, they mean.
AND many of those same "Deniers" claim not to realize current conditions of resulting White Privilege since that understanding (acceptance) would come with the cost of recognizing ongoing Racist practices.
Acknowledging White Privileged Status would make them Complicit, they'd not only have to share the Guilt of behavior their Ancestors have never been held accountable for, they'd also have to accept shared Responsibility for that, as well as for current ongoing discriminatory practices.
That can't be allowed to happen, since it would threaten their Current Entitled Social Status. Equality isn't one of their priorities, let's just say.
So they instead LOUDLY proclaim their own innocence (I'm not a Bigot, and besides, I'm not responsible for what my ancestors have done, right?) Without concern for the Generational impoverishment of others that's resulted in their current conditions of relative Comfort.