Well then I guess I didn't state it strongly enough: society does worse when the startup process is only accessible by the rich and priviledged.

YC isn't under an obligation to do the best it can for society. But if it wants to do that, or even to approximate it, the filter functions it uses implicitly and explicitly need to be considered carefully. YC has said a variety of things that indicate that it does have some desire to trend in this direction, at least in the past.