Well, you would know. Personally I've met maybe a hundred Mormons and noticed a distinct tendency towards apparent overall happiness, social wellbeing, et cetera. FWIW most of the Mormons I know are from Tucson, and some of them look on the Utahans as being a somewhat separate tribe.
It's probably like zero information, but the only Mormon who I know went to BYU, also happened to be the surliest one.
(And obviously this is all modulo huge selection effects on who I've met. I don't exactly live a normal life.)
Yeah, I'm most familiar with Utah/Idaho Mormons who tend to be on the more extreme spectrum. The problem is that these are the guys who hold the power in the Church.
Something that hasn't been mentioned is that Mormons give 10% of their income to the church. AFAIK, the vast majority goes into building and maintaining churches and large, extravagant temples, and a very small portion actually goes to real charitable work. If you could convince a Mormon to leave the church but still donate 10% of his income to a more effective charity, I think you'd end up doi...
From the final chapter of his new book Cowards, titled "Adapt or Die: The Coming Intelligence Explosion."
The citations for the chapter include: