For anyone serious about the circumstances and a discussion about the real causes of the Vietnam War, there is a good on on youtube. The two talk about Burns documentary as well, and his background.
Tim Kelly and Joe Atwill on the Vietnam war, 2 weeks old:
https://www.youtube.com/watch?v=w8DtfbkaK4I&t=938s
So, the US government wanted to destroy a large segment of our population so they had the CIA engineer a war in Vietnam so that a counter-culture would rise up in an anti_american peace movement at home and to make sure they got maximum effect, the CIA used MK Ultra and Phoenix program science to create the sex, drugs and rock & roll culture? Wow! How in the world did these guys figure all this super secret government stuff? /s