A new book 'A Great Place to Have a War: America in Laos and the Birth of a Military CIA' by Joshua Kurlantzick and a WoTR article reviews the arguments. It starts with:
If you work at it, you can make a case that Americans fought on the right side in Vietnam. There is an argument — not conclusive, but defensible — that with all its faults, the anti-Communist side offered South Vietnam’s people a freer and more prosperous future than they would face if the Communists won. That didn’t mean war was a wise choice or that its goal justified the death and destruction it caused. But Americans looking for some moral comfort could at least tell themselves that they were fighting for a better outcome for the Vietnamese. By contrast, it is harder to find anything morally defensible in American actions in Laos and Cambodia. U.S. operations in those countries, including among the heaviest bombing in military history, were conducted to support American objectives in Vietnam rather than for any achievable benefit for its smaller, weaker neighbors. That was also the reason for U.S. air support and military aid that kept weak, ineptly led local Laotian and Cambodian ground forces in the field long after it was clear they had no chance of winning against their stronger North Vietnamese enemies.
Link:https://warontherocks.com/2017/02/th...ormed-the-cia/

His Amazon bio:
Joshua Kurlantzick is a senior fellow for Southeast Asia at the Council on Foreign Relations. He has been a correspondent in Southeast Asia for The Economist, a columnist for Time, the foreign editor of the New Republic, a senior correspondent for the American Prospect, and a contributing writer for Mother Jones. He has written about Asia for publications ranging from Rolling Stone to The New York Times Magazine. He is the winner of the Luce Scholarship and was selected as a finalist for the Osborn Elliot prize, both for journalism in Asia. He is the author of four previous books on Asia. For more information on Kurlantzick, visit CFR.org.
Link to Amazon, with very mixed reviews:https://www.amazon.com/Great-Place-H...+to+have+a+war