It used to be trash was trash and skin color was irrelevant - actually, still is irrelevant, because it’s the culture that matters, not the color.
In the past, people of all shades of skintone would look down on those who chose to act trashy, shiftless, and criminal.
Now there’s a whole political party that depends on the trashy, shiftless, and criminal for its continued existence.
There is a universal knowledge in humankind of what “ought to be” and how you “ought to behave” and also a universal understanding that you fail to meet that standard and that there will be a judgment for it.
From this visceral understanding comes the need to “do something” to “get right”.
For some, it’s works.
For most leftists, it’s advocacy.
When you present evidence that their advocacy is actually harmful, or at the minimum, not helpful,
you are destroying their only perceived way of “getting right”.
That’s why they deny it.