The words "creeping communism" was a reality following WWII. Russia created the Soviet Union, and China was undermining governments throughout Southeast Asia. Even Cuba ended up sliding into communism under Castro. It was real, and it wasn't an imaginary threat, it was real. It was real down to the point of Kruschev pounding a shoe on the table at the UN saying he was going to bury America.
It's what triggered us going into Korea and continued with what happened in Vietnam.
For those of you who didn't live under the threat of nuclear war, which was always on the table from the Soviets, you'd never understand. The drills, in schools, to get under your desk as the only protection against bombs and possible survival, and the countries slowly turning to communism. Then growing up, joining the military, and facing things like the Berlin air crisis, threats out of Cuba by the Soviets, and near war when Kennedy was almost ready to pull the trigger, and eventually Vietnam.
Reading a textbook and thinking you understand the history of the time, or that it was all a foolish war is really not understanding history at all. It's like going to war. You can talk about it, how you'd do this or that if you were in combat, and you can talk about mistakes people make during them, but until you're actually part of it you'll never understand what it really is or was.
I lived through it, and I learned from it. If I said I came out a better person for it, that's not really true. What I did was come out as a different person who has seen things differently since then. I went from an 18-year-old kid to a 24-year-old man who never had the opportunity to enjoy campus life at some university, where I could rail against something because it seemed like the "in thing to do" at the time. Instead, I came back bitter against so many young Americans who made it impossible for me to take a commercial flight from San Francisco to Minneapolis in a uniform I'd earned the right to wear, because they were too busy railing against something they didn't even understand because it was the "in thing to do at the time."
Sorry! If this sounds a little bitter, it has been for me now for 60 years. People need to do a deep dive into the era, not read bullet points and think they understand an era. I found that even professors in college who were supposed to be well versed on the subject were nothing more than anti-war protestors of the era whose whole existence was self-serving and lacked any real understanding of what was happening. They too lived in their own little cocoon of self-righteous beliefs that totally missed the scope of what was happening in the world. To make it worse, many of them taught Political Science.