On the other hand, it's not at all surprising. It takes a significant amount rationalization, compartmentalization, and cognitive dissonance to accept the life of Sisyphus. But I think most atheists do it to a varying degree, and once there, comfortable, they don't want move back toward the possibility of existential despair. Of course, this is just me psychologizing, but I don't see any validity to their arguments, and they're fairly thin, so I'm left with the hypothesis that they haven't examined their arguments well for the reason I mentioned.