TOS was never any kind of utopia. Was it better than the real world at the time of production? Certainly. But most definitely wasn't an idyllic landscape.
It was a populist world where supreme dictators were defeated by civil disobedience, which was the
episode moral.
It was
definitely a Utopia compared to an uninhabited Earthlike planet.
And Khan didn't choose isolation. It was his sentence to be put on Ceti Alpha V, since Kirk himself said in his log entry that it would be a waste to try to 'rehabilitate' him.
OH God...
Captain's Log. Stardate 3143.3. Control of the Enterprise has been regained. I wish my next decisions were no more difficult. Khan and his people. What a waste to put them in a reorientation centre.
And what do I do about McGivers?
So Kirk didnt want to sentence Khan and his crew, because it would be a
waste of their potential. He knew that Khan had learned his lesson, that
nobody would follow him anymore, from his experience when he gained control of the Enterprise... and NOBODY from Earth would follow him, even his retro collaborator.
[Briefing room]
(The senior staff are in dress uniform again.)
UHURA: Record tapes engaged and ready, Captain.
KIRK: This hearing is now in session. Under the authority vested in me by Starfleet Command, I declare all charges and s455pecifications in this matter have been dropped.
MCCOY: Jim. Agreed you have the authority
So Kirk
dropped all charges, and so Khan and his crew were free to go where they wished.
KIRK: Mister Spock, our heading takes us near the Ceti Alpha star system.
SPOCK: Quite correct, Captain. Planet number five there is habitable, although a bit savage, somewhat inhospitable.
KIRK: But no more than Australia's Botany Bay colony was at the beginning. Those men went on to tame a continent, Mister Khan. Can you tame a world?
KHAN: Have you ever read Milton, Captain?
KIRK: Yes. I understand. Lieutenant Marla McGivers. Given a choice of court martial or accompanying them there.
KHAN: (gazing into her eyes) It will be difficult. A struggle at first even to stay alive, to find food.
MARLA: I'll go with him, sir.
KHAN: A superior woman. I will take her. And I've gotten something else I wanted. A world to win, an empire to build.
KIRK: This hearing is closed.
(Khan and McGivers are escorted out.)
SCOTT: It's a shame for a good Scotsman to admit it, but I'm not up on Milton.
KIRK: The statement Lucifer made when he fell into the pit. 'It is better to rule in hell than serve in heaven.'
As Khan said, he left Earth in the first place because he wanted
a world to rule, not a populist galaxy to serve.... when he became Earths first interstellar pioneer, boldly going where no man had gone before.
And so of all people, Kirk understood this more than anyone.
So he granted Khan his original wish.
A world to win, an empire to build.
There was no SENTENCE. It was just a moral of populism vs. Social Darwinism, vs. Khans statement...
Captain, although your abilities intrigue me, you are quite honestly inferior. Mentally, physically. In fact, I am surprised how little improvement there has been in human evolution. Oh, there has been technical advancement, but, how little man himself has changed.
But he was wrong... man
had changed, just not by
his way of thinking.
And that was the moral of the episode, i.e. the subversion of Nietzsche.