Anyway, the public/private sector discussion is a red herring, it really doesn't have anything to do with the subject at hand.
The FACTS are, that we know that an increasing percentage of the population is unhappy enough to answer as such in surveys.
And we know that the negative responses disproportionately skew to those under 30.
Beyond that, this thread has really been nothing more than speculation as to why. There's some plausible speculation, and some stupid-as-shit speculation, and some insensitive "don't care got mine" responses as well.
What I'd be most interested in finding, is WHY those who responded as unhappy, did so. I'd like to find it out directly from the original set of respondents. And I'd also be interested to view similar past surveys over time, of the same age ranges, to see what the trends look like for those age ranges, over, say, the past 60-80 years.
As a solid GenXer, I can say that plenty of my peers had some fairly negative views of their surroundings, from ages 18-30. In some ways it was expected or even fashionable to behave so-- youthful rebellion, young-person's angst, and all that. But as I, and my peers, have become older, and gained perspective,, and learned how to live a contented life, much of that angst and fear and anger, have faded and been replaced by happier feelings. This is only anecdotal of course, but that's my own experience.
That's why I'd be interested to see the trends over time, from generation to generation, of such a survey.