ummm...
[Vox] Day was answering an (obvious) rhetorical trap. If the discussion were to be read and followed,
you would find that he is NOT, in fact, advocating killing infants. The issue involves absolute morality and obedience- the morality being defined as a Command from God. Since the Christian church has long been guilty of being "pro-life" (rescuing exposed Roman infants in the first century) there is de facto evidence that Christ has not commanded offing toddlers. Then there's that whole New Testament thing...Jesus blessing the little children.

If God commanded to kill the li'l babies, it would be Moral.
He has not, so it is not moral.

Reading with comprehension is much to be desired.