Imagine if a group of Federation like aliens tried to evaluate us like Starfleet supposedly doesn't with its encounters. As much as I love Star Trek the Federation pretty much thinks it knows what's best and Prime Directive or not they leave their 'footprint' everywhere they go. I just wonder if for example a different set of ethics and alien thought was the guiding principle for contact how that would play out? Say a group of aliens felt it was moral to have (a la Logan's Run) under thirty year olds only to populate a planet. A Prime Directive should protect us from them influencing us but what if they kind of decided to 'help' us anyway, lol.
When you compare Kirk's interpretation and Picard's interpretation of the Prime Directive, I prefer Kirk's. Sure, it involves a lot of judgments being rendered against stagnant civilizations, but Kirk honestly wants the civilizations he discovers to thrive and survive.
Picard just makes a sanctimonious speech, orders another tea, Earl Grey, hot, picks up his Shakespeare book, and it's on to the next assignment. Who cares if people will die if they don't intervene, or if people could benefit?
As for Logan's Run, there's a difference between the original novel and the movie. The novel had Lastday set at age 21, not 30, and the reason for it was overpopulation. There was no nuclear war. There were several large city complexes throughout North America and Europe (probably other areas as well, but the novel didn't go into those), connected by mazecars. Carousel isn't in the novel. People on Lastday have 24 hours to wind up whatever affairs they might have, and report to a Sleepshop for euthanasia. If they choose to Run instead, that's when the Sandmen come into it.
Kirk would definitely take out the computer controlling that system. Picard would likely find it a revolting way to run a planet from a personal perspective (can you imagine a world where the only officer you have who could safely beam down without being legally executed for being too old would be Wesley Crusher?), but he'd leave it alone just on principle.