Re-fighting past wars is always interesting. IIRC, Ho Chi Minh after WWII asked the USA to support him in riding Viet Nam of the French. The USA had a problem with our allies that wanted us to defeat the Japanese AND support their colonial empires. Churchill wanted diversion of resources from attacking Japan directly to screwing around in South East Asia, Burma, The 'Dutch' East Indies for those reasons. Ho got no support and turned to the socialist countries. Perhaps he was a socialist, he did work as a waiter, dishwasher in Boston, I recall. However, he was a Viet Namese nationalist and didn't like the Chinese as most Viet Namese felt. They have fought them for a 1000 years. We might have turned into a neutral socialist but counterweight to the Chinese. Recall, we supported Tito and supplied him with weaponery. His air force was USA planes (true it was Canadair Sabres).
NO, we had to support colonial idiocy. Thank you God, that Eisenhower resisted called to nuke them for Dien Bien Phu. Later studies during our war indicated that even liberal use of nukes couldn't shut down the trail. So the military kept pressing for conventional solutions. Given the nationalist bent of the Viet Namese we would still be fighting them if we occupied the North.
There is also the lost cause mythology. It goes like this - we were better fighters, tacticians, etc. - but those darn winners just had to much stuff. The Civil War, WWI and WWII had those whining AARs by the losers.
A second mythology is that the initial 'shock and awe' attack will win a long term war. I cited a book about that in the book thread but am too lazy to look it up. The scholarly author convincingly demonstrates that it doesn't work except against trivial opponents. Major ones fall back and can win the attrition and logistic battles. With intermediate opponents, their convictions will keep them fighting and screwing up your 'successful' occupation.
As an aside - here's an analysis of the logistic problems of fighting China:
https://news.usni.org/2019/05/17/stu...ght#more-57794
That's for those who think we have a secret plan to win quickly and the professional literature is incorrect.