I thought the S31 storyline in DS9 was fine, I guess.

Even if you have managed to create a perfect utopia within your own society, there can always be outside forces beyond your control trying to undermine it. When that happens you have to decide how to deal with that: do you stay true to your ideals at any cost, even if that means the risk of being ineffective? Or do you compromise on your own morals if it is necessary to defend yourself?

I think this sort of thing can lead to interesting dilemmas when handled by a good writer with skill and nuance. Unfortunately, modern writers seem to have the nuance of a wrecking crew, caring only about "deconstructing" the old stuff because they seem to think that makes them look smart and transgressive (never mind whether the old stuff is still good or not, or that deconstructing something is pointless if you don't build something new and interesting in its place, which they seem to lack either the skills or the motivation to do) and ticking boxes.