If God is morally perfect then He must perform the morally best actions, but creating humans is not the morally best action. If this line of reasoning can be maintained then the mere fact that humans exist contradicts the claim that God exists.
Look at the assumption required for the second half of this sentence. “creating humans is not the morally best action”. Says who? By what standard? As usual, I think we can guess what that is.
Walker suggests that God is morally culpable for creating human beings with defective natures (defective in comparison to God’s).
Is He, now? Culpable to who? Oh, wait. That’s the assumption! The same assumption all of these dumb arguments make. God is answerable to man. That’s funny, here I thought Scripture answered that sort of ridiculousness.
What shall we say then? There is no injustice with God, is there? May it never be! For He says to Moses, “I WILL HAVE MERCY ON WHOM I HAVE MERCY, AND I WILL HAVE COMPASSION ON WHOM I HAVE COMPASSION.” So then it {does} not {depend} on the man who wills or the man who runs, but on God who has mercy. For the Scripture says to Pharaoh, “FOR THIS VERY PURPOSE I RAISED YOU UP, TO DEMONSTRATE MY POWER IN YOU, AND THAT MY NAME MIGHT BE PROCLAIMED THROUGHOUT THE WHOLE EARTH.” So then He has mercy on whom He desires, and He hardens whom He desires. You will say to me then, “Why does He still find fault? For who resists His will?” On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? Or does not the potter have a right over the clay, to make from the same lump one vessel for honorable use and another for common use? What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction? And {He did so} to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory, {even} us, whom He also called, not from among Jews only, but also from among Gentiles. ~Rom 9:14-24
See, man always believes that he can pass judgment on God. That he is morally autonomous. Scripture says differently. This text rightly denies man’s ability to judge God. It then goes into an explanation of God’s intention in the creation of man. God is not unjust. A Holy God can rightly judge the man with a fallen nature – and the fallen man cannot judge the Holy God. This argument fails on point #7, for those interested in the formal argument also included in the post linked to above. I’m not concerned with the rest of the points, although I would likely dispute them if 7 didn’t fail so spectacularly. The reason 7 fails is because it introduces that pesky “should”. 
Who says He “should”? Man does. Man is not capable of imposing a “should” upon God, as man is not morally autonomous. Scripture relates to us why that “should” is incorrect, and the argument fails to even give any reason whatsoever why the “should” is applicable to God. It is an assumption of human autonomy.
I truly wish atheists who make these sorts of arguments would pay more attention to what they are arguing against. I’m sure this will be touted, with much hoopla, in that community – but it is not anything novel, damaging, or even explanatory. To break it down, a pot says “I don’t like the way you made things. If you didn’t make things the way I wanted, I deny that you exist – because I’ll only believe in a Potter that makes things the way I want them to be.” Not overly satisfying, or convincing. It would also help if they didn’t use an argument directly countered in Scripture. That would, of course, assume that they had read it. It doesn’t look like this atheologian bothered, sadly.
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