Let's see if I have this straight. We need affirmative action to remedy the injustices of slavery. The premise here is that even 8 or more generations after slavery was abolished, the effects are still being felt. Since the great(X8)grandparents had few opportunities, their offspring were impoverished and so on, generation after generation. (Or if we're blaming it on lack of civil rights legislation, subtract a few generations.) But an adopted child, presumably, will inherit the cultural advantages of his adoptive family, not the disadvantages of his genetic family. So if someone with no cultural history of discrimination needs affirmative action, then they are admitting that there is some inherent genetic deficiency. If this is the case, then we will never be rid of affirmative action.
So, is this a cultural/opportunity problem or an issue of genetics. I'd be happy to go with one side or the other, but you can't have it both ways.
Don't waste your time trying to convince a shameless opportunist of that! They want "it" every which way that will give them an advantage.