In short, no example in itself is likely to change anyone's mind. Some just have to learn the hard way, as a number of US veterans did. -- Yoshie
Ouch. I agree with you on Vietnam. The U.S. engaged in a war of aggression, but the government did keep it secret for as long as possible from its citizens.
However, as the right is wont to do, you are confusing and conflating many issues, and trying to change the subject.
During World War 2, the Soviet Union committed atrocities, like the the massacre of Polish officers (btw, the wonderful film Enigma touches on this) and indeed the Allies firebombed Dresden, etc. However, the Nazis - driven by an insane ideology and btw previously supported by the British Tories and sections of American big business - were unquestionably the aggressors, agressors who it turned out would fight to the death. This is a better analogy than the Vietnam War.
It's very difficult to calculate, but one would imagine that the toll on humanity would have been worse had the U.S. sat out WWII. Even though the war drove many Germans and other Europeans to end up supporting the Nazis, many who might not otherwise have done so, 60 years down the road you have a country that put on the largest, best demonstrations against Bush, during his recent college tour of Europe.
(W.'s gall is hilarious. When a German journalist asked him something like what right or what reasons do you have for invading Iraq, W. replied "Because he's a dictator who gassed his own people." So there.)
Peter