That's easy; we have to look at both cases in some detail.

-Forking over a part of our genes, mind, society and culture to create new beings with new complexity, knowing that less than optimal conditions await them, -

-versus refraining from erasing all of the extant and potential value and complexity of current beings, here and now, for a very mixed blessing (increasing the smileyness of faces while decreasing the amount of tiles). The second action has much greater utility, and is not very much like the first at all. So we could easily do the second while avoiding the first, and be consistent in our values and judgment.

Sorry, I'm a bit high.