When it comes to human life (in this case innocent human unborn babies), I don't see how intention carries any weight when it comes to deciding whether they should live or die-- especially if one is responsible for creating them so that one should be selected and the rest should die. Just because one might argue that it is a good to bring one baby into the world, it doesn't negate the evil that is done when several other innocent human lives are destroyed as part of the process.
Well, not everyone who wants a child follows your particular religion or philosophy regarding embryonic life.