the fact that there were no "communist" "exterminations" in Vietnam when the War ended

Do you mean that whatever was wasn't communist (but say nationalist), or that it wasn't extermination (but say a purge), or that there was no significant post-victory bloodshed?

*Traitor*, n.
A benighted individual who perceives an illusory distinction between serving his nation and abetting the criminals who govern it.

I had a rare chance to peek into World History exam papers of US College freshmen and there was a tendency to cast everything in American terms regardless of the country and time period involved. For instance, one Student wrote that "China had a system of Checks and Balances". This, to me, showed the damage that "civics" classes do to American High School students. It equips them with a collection of set phrases and poorly undestood concepts with no critical thinking and no context. It is next to impossible to have a sensible conversation with them about politics outside the US (national or international).

Those whom the Gods wish to destroy They first make mad. -- Euripides