Help with a Perry Mason episode (original TV series)

I have a dim memory of a scene from the original (1957-66) series where Perry Mason is talking with college students or demonstrators who defend their protest by saying unlike earlier generations, they are faced with the existential threat of nuclear annihilation. Mason responds with something like, “every generation has faced a similar prospect, from war or plague.” Am I misremembering? If not, can anyone direct me to the episode?

There were a number of “youth-oriented” episodes toward the end of the series. If it’s any help, I’d confine my search to the 1963–65 seasons.

Many thanks!