Because nothing says advancement like attaching oneself to a political ideology that was literally initially born out of the desire of racist oppressors to stop said advancement?
It's like Japanese whale hunters joining Greenpeace. The logic is a tad unsound.
No, silly…it was founded to advance the rights of Blacks. And it did that.
Now, its sole purpose is to grift money from ignorant liberal whites and intimidate businesses into donating money in order to funnel all that cash into the DNC.