Can you manage an honest discussion? I said,
You are suggesting that "the "communist threat" represented by Vietnam" is a perfect synonym for "communism". Since you obviously haven't been paying attention, it is the very subject of the term "communism" and its meaning which are under discussion. Maybe you'd like to provide your definition. While you're at it go ahead and specify who "they" are, so we can learn a little bit more about your new body count.
The word "communism" had been in use as a political bogeyman in the U.S. long before the Vietnam war, or even WWII. The post-WWII acceleration of this was one of the more abiding disgraces of the 20th Century in this country. Some remnants of that shameful episode still exist to this day, as is apparent by the ease with which even the term "socialism" can be used ( or maybe I should say "misused") as a pejorative by certain parties.