“How real was the threat of Communist spies within the USA?”
P1: Communist spies threat are real in the US when their actions are proven active with evidence.
P2: The US government (HUAC) is often using McCarthyism; which is the “practice of publicly accusing someone of subversive activities without evidence to back up the charges.”
- Therefore, communist spies are not real in the United States
 
"Is it fair to say that the anxiety caused in the US due to nuclear threat, was useful and 'healthy?' (Security of the nation . . . = its health).
P1: It is fair to say anxiety due to nuclear threat is useful and healthy in the US when the government let their citizens feel secure. 
P2: The Duck-and-Cover drills for children and the Defense shelters made people believe that the government has ways to protect them from massive destruction (Atomic Bomb).
- Therefore, is it fair to say that anxiety due to nuclear threat is useful and healthy.