> The utopian bits were never really explained, either.
What would the effects of growing up in a post-scarcity utopian society be on a human? To never fear poverty or hunger? To be sure that no matter what they do (or don’t) they will be housed and cared for as long as they live?
I assume the people in Starfleet would be the ones who are most inclined to work for their betterment, with no fear of competition, with the drive to do The Right Thing. Outside the organisation there would be people who would be totally happy in doing nothing.
We can look at publicly documented trust fund kids or other (financial) elites and their behavior to get an idea and it runs the spectrum. Princess Diana. Prince Andrew. Paris Hilton, both when she was in the news every day and the quieter stories that have surfaced since. 50 Cent's talked about his child preferring to have money that he didn't have to work for.
It's not the same since they exist in a world where most other people aren't at that level, but we can see that the human psyche isn't always able to manage it.