I don't think that, nor was I saying that.
I know, for example, the roots of the Vietnam conflict go back much further, at least to the 19th century French colonialism. the decision to escalate in the 60's was very much made in the Pentagon & WhiteHouse after the fraudulent Gulf of Tonkin incident, and were easily avoidable IF we wanted to avoid a military quagmire. Ho Chi Minh had reached out to us post-WWII. we ignored him, and made the decision to bankroll the French military effort in the 50's.
the whole conflict, who wanted it, why it happened, who profited from it, and how and why we lost, none of those things are unknowns. just like the history of racial oppression and the Civil Rights movement, backlash to consumerism of the 1950's, the roots and causes of the Drug War... all that information is out there, but is intentionally obscured in the history books.