Does civilization improve the net happiness of human beings? This would seem like a "duh" question. Of COURSE civilization improves everyone's happiness. You get more stuff! Like iPhones and the internet and cappucino.
As I have begun "decivilizing" my life, I've found that more and more I'm happier with simple things. Going to a movie theatre would be a horror for me. I much prefer sitting on the porch and watching the sunset. Going to a restaurant is no longer enjoyable. Stirring a soup pot over the woodstove in winter has become a family discussion point.
If you cut your life free of the concept that "things make us happy" then you can begin to see where the lie of civilization unfolds.
I reject the Hobbesian viewpoint that life before civilization was "nasty, brutish, and short". We don't even see evidence of that today, where the only hunter/gatherer societies have been pushed into adverse environments that "civilized" man doesn't want.
Jared Diamond, in one of his books, noted that no culture affords its adherents more leisure time than primitive hunter/gatherer ones. The book, "Stone Age Economics" would seem to validate this, as it has documented observations where hunter/gathers spend no more than 4 hours a day providing their needs. A four hour workday! When was the last time you could survive on just that?
Men with industrial minds require others to share that same viewpoint. They cannot share a world with happy and simple agrarian peoples. The other model is simply too appealing. Do you not dream of a much simpler, agrarian life?