Nah, it was our own predilection for patella-reflex classifications over studying situations that got us entangled in Vietnam. "That Minh-guy's a Red" was where the analysis of Vietnamese goals and intentions stopped. It didn't help that the 1950's Red Scare purges had pretty well emptied the foreign and intelligence services of most of the experts on East Asia.
As for the French, yeah, they probably tried to hang onto the previous' century's business model for too long, but we can't blame our own stupidity on them.