The Difficulty of Optimism

The other day, Jo Walton, another author, posted a commentary on Tor.com about the decline in "optimistic" science fiction books, claiming that she found few SF books that showed a "positive future" and asking "Why is nobody writing books like this now?"

I won't quote extensively from her article, but she does make the point that optimistic science fiction was written in the depths of the Great Depression, through WWII, and through the 1950s, none of which were exactly the most cheerful of...