

It can still be utopian and aspirational without every character being those things. The same way you could have a show where you explore the concept of Justice by having a profoundly unjust main character. Or a show about Sin with a righteous main character. Sometimes you explore a theme by demonstration, sometimes by contrast.
In fairness, there was a whole episode of ds9 about obrien struggling with his trauma.
Maybe their therapy techniques are as advanced as their other forms of medicine?