The Cold War wasn't a time of crisis. At worst it was a time of incredible competition. The average American saw minimal change in quality of life during the cold war, and during world war two, the average Ameran's QOL was much higher.
The USA's Territorial integrity was only truly threatened a couple of times throughout the cold war, and not once was it (Credibly) threatened in World War Two.
On top of that, banning Communism did absolutely nothing to prevent it's spread. As stated previously, you cannot effectively ban an idea. All it did was stir up political hysteria further, "Communism" was even more of a scape goat than "Alt-Right" or "Nazi"is today. It didn't accomplish anything, and it only gave the real communists more ammunition to use against the government.
You cannot imprison an entire ethnic minority in the US under some baseless idea of "Disloyalty". It wasn't necessary, in fact, it didn't even accomplish anything. It did nothing but, again, further stir up political and social unrest.