I think what he's saying is, if the ultimate authority sets the bar for what is justifiable, then by definition the commands of that ultimate authority are justified, even if we don't understand it... or don't want to understand it.
Ever notice that when it seems like a person is making a decision about the life or death of another person, they're accused of "playing God". There's a reason for that.
If you don't believe in God, it's easy to decide that the reported actions of people acting in His name are horrible, because you figure men made those decisions... decisions which men have no right to make.
However, keeping consistent with belief in God as the creator of everything means understanding that He put us here, and He can take us away.
We might not understand certain decisions he makes... we might think them cruel, or unfair, but it's not our call to make.