Catholic War Resistance

I was surprised to learn several interesting details regarding the peace work and stance of the Catholic Worker movement during the Vietnam War.  While I was aware that voluntary poverty was a standard tenant of the Catholic Worker movement, I had supposed that the movement had appropriated this idea from the many religious orders of the Catholic Church.  The fact that Dorothy Day used voluntary poverty as a way to resist war taxes, and that she "elevated it to a precept of the movement" for that purpose was a brilliant move on her part, both as a way to create solidarity between her new form of monasticism and the old, and as a way to very visibly reject the war power of the United States. [1]

Further, while I was aware from Daniel Barrigan and Thich Nhat Hanh's book The Raft is Not the Shore that several Buddhist monks had self-immolated themselves in protest against the war both in Vietnam and in the United States, I was unaware that a member of the Catholic Worker movement had done the same.  Barrigan and Hanh set forth a sort of Catholic-Buddhist theology for the act of self-immolation in that text ten years after Roger LaPorte set himself on fire.[2] I would imagine that LaPorte's death effected Barrigan greatly.

While I am aware that as public sentiment turned against the war it created more and more pressure on U.S. politicians to end the war, the war lasted for almost ten years from the time that LBJ ramped up the war after the Gulf of Tonkin.  What I don't know is how much of an effect did the actual peace movement itself have on the eventual ending of hostilities between the United States and Vietnam. Is it possible to separate the effects of the war being unpopular from the active resistance of the war by groups such as the Catholic Worker?

[1] Anne Klejment, American Catholic Pacifism: the Influence of Dorothy Day and the Catholic Worker Movement (Westport, CT: Praeger, 1996), 163
[2] Thich Nhat Hanh and Daniel Berrigan, The Raft Is Not the Shore: Conversations Toward a Buddhist-Christian Awareness (New York: Orbis Books, 2001), 63-72.