Normally "genocide" is considered bad because it results in living people being killed. I think we can all agree that killing a living person against their will is bad.

But with what you describe as "genocide," not a single person is harmed. To me, an African American person has the same intrinsic value as a white person or anyone else. Therefore, I can't see any particular reason why I should care if we have more or fewer African Americans in the world.

I'm familiar with the argument made by deaf people. But those advocates never seem to address the reversal argument; why shouldn't we also produce new deaf people (e.g. by sedating some children and painlessly puncturing their eardrums) in pursuit of this goal?