The assertion was that life or existence itself is pointless, nothing to do with the esteem of individuals. You say "people like Martin Luther King Jr" would beg to differ about gtt's assertion, but you follow-up by saying "your life doesn't have to be pointless." So, a life can be pointless? So you disagree with MLK? Either that, or your entire comment doesn't really have anything to do with gtt's.

Regardless, the worth of an individual wasn't really what gtt was getting at.

So, SimCity guy felt compelled to be awesome at SimCity, besides that I don't know much else about him. But there are billions of people in the world, so there is room for someone like him and there is almost no reason to stifle diversity in personalities. After all, that's how MLK eventually came to be. Perhaps the same force that compels SimCity guy to build awesome Megacities is compelling him to do something else that most people would consider more worthwhile.