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.
Yesterday I gave this link to my friend architect who is some kind of postmodernist. He says he is not, but I am unable to find a better description of his views.
Today, we have met for a glass of vine and he expressed his reaction. He was quite eager to.
According to him, transhumanists have "Faustonian complex which should be outgrown". I said that he could use "the Dedalian complex" - (100 and more years ago, when there was no airplanes yet) for an argument in a debate about flying.
The rest of his arguments were even more "postmodern".
http://www.ted.com/talks/nick_bostrom_on_our_biggest_problems.html