I'd be interested to know how the people who analysed those numbers define "happy". Content? Blissful? Smug? I know from experience that a drunken person can be happier (though not necessarily so) than a sober one, albeit temporarily. Collect together a group of similar-minded individuals and convince them they are God's Chosen and hence superior to the rest of humanity, and I've no doubt their "happiness" rating reaches to high heaven.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'