The thing about this episode that stands out for me is my reaction to it when I saw it premier in early 1968, when I was 14. Terri Garr's character, far from playing as a ditzy blonde, instead read to all of us as a member of the baby boomer generation saddled with the hypocritical bs of those over 30, who we were learning to Not Trust. Thus her character suspiciously blowing the whistle on one and all, ultimately leading to her fine peroration toward the end where she expresses the hopes and fears of a generation. We all marveled at this episode in school during the course of the following week, and all boomer trekies have a soft spot in their hearts for Terri Garr on the strength of this performance. I'd also add that you have to remember we were all too close in memory to the Cuban Missile crisis of Oct 1962 for comfort. The notion of a nuclear war was physically felt back in those days in a way that it hasn't been since, well, 1962.