"Nanny" aliens, such as Gary Seven and Questor of THE QUESTOR TAPES.
If a civilization cannot—and is not allowed to—overcome its own faults, then it is baggage. Or as Spock said in "The Day of the Dove": "Those who hate and fight must stop themselves, Doctor. Otherwise, it is not stopped."
Alternatively, "the only kind of discipline is self-discipline."
Plus, what Gary Seven did as told by Greg Cox in the novels he wrote just caused said nuclear holocaust to happen anyway.
Never mind later this week -- found it!
TO: Fred Freiberger
FROM: Gene Roddenberry
DATE: May 23, 1968
SUBJECT: “Wink of an Eye” Story Outline 3/22/68 by Lee Cronin
(excerpted from a 3-page story memo)
I think also he will see that we don’t have enough inter-character relationships among our continuing people. We need conflicts, disagreements, rich personality relationship between Kirk, Spock, McCoy and others. Otherwise, our “television family group” becomes a rather uninteresting assortment of similar individuals who stand around throwing each other lines and generally agreeing with each other.
Of course, Roddenberry reversed his position on inter-character conflict twenty years later, which, ironically, caused quite a bit of inter-personal conflict behind the scenes of Star Trek: The Next Generation
Methinks that on the last one, Roddenberry was becoming senile and out of it as far as TV writing was concerned, and he should have been kicked upstairs just like he was when the movies with the original cast were being made.