And, the US was defending the Republic of Vietnam from an invasion. Whatever the US administrations and military leaders did wrong, THAT was not one of them. Let's put things in their proper context, for starters. You're talking about an authoritarian communist regime which, during the 1950s, was murdering many tens of thousands of North Vietnamese civilians, stealing the property of everyone else, and using terror tactics to subject the whole population of North Vietnam to a total destruction of rational social order. None of the usual excuses from historical revisionsists like you apply here: this wasn't self defense because...