He explains it:
Indeed, I've wanted to live in a Bubble for as long as I can remember. Since childhood, I've struggled to psychologically and socially wall myself off from "my" society. At 40, I can fairly say, "Mission accomplished."Of course, if the society you live in is "dreary, insipid, ugly, boring, wrong, and wicked," then what the hell? If it is taken over by Klingons, it can't get any worse, and it just might get better.
Why put so much distance between myself and the outside world? Because despite my legendary optimism, I find my society unacceptable. It is dreary, insipid, ugly, boring, wrong, and wicked.