Answer:
I think Americans at the time felt extremely unsafe, it was already an unsafe time for people of color and minorities. Adding on the fear of a global nuclear war would make anybody horrified, regardless of socioeconomic status. For example, Japanese-Americans located in internment camps would fear for their family and livelihoods ontop of nuclear war. Another example would be caucasian citizens who could fear being accused of espionage or communist activity as well as nuclear war. The cold war was a time where the U.S govt was against everyone, including it's own inhabitants.