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Partially because the real battlefield was moved. In that battle people such as Joan Baez and Jane Fonda were the generals and won the real war taking place here.
And don't forget that Commie s.o.b. Tom Hayden who still somehow plays an important role in CA politics.
My main recollection of the period was that Johnson and McNamara also were terrified an expansion of the war with real victory as the objective because it might have invited nuclear retaliation from Russia. So was Nixon later on. In addition, China was sending endless numbers of soldiers and huge amounts of supplies to the North and was threatening to send massive numbers of troops to fight. In effect, we didn't know what the hell our objective was there, and 58,000 Americans died as the result of McNamara's indecisiveness. He's as much as admitted it in a recent book.