It's because predicating carefully-chosen giveaways to "the right kind" of people with darker skin is easier and preferable to the elite than what is actually righteous and necessary: capital transfers (reparations) to the descendents of people who were wronged, and the people who are affected by stigma against the people who were wronged.

The fact that all of the various workarounds end up targeting people nominally outside the scope is a feature, not a bug.