And what if that person didn't even actually commit the act he is supposed to apologize for? For instance I haven't yet gotten around to apologizing for all those slaves I never owned.
Well, by implication, because of your skin color, regardless of whether your ancestors were even in this country when slavery was practiced but instead were virtual slaves themselves in the "old country", you are still guilty.
So, suck it up and out with the apology. And while you're at it, get out the pocket book and fork over the financial reparations that you don't owe.