Leaking those documents might be good or it might not, it might be the right thing to do or not, but it certainly isn't journalism. It's ... well, just publishing unconfirmed raw data. Journalism should be different.
I know it's hard to know about that, given the American media's focus on internal affairs and the American habit of more or less not caring about the rest of the world, with the exception of a few, but let me reassure you: Everybody else gets picked on too. And America is meddling almost everywhere, so you should expect flak from almost everywhere.
I think you guys still got it wrong: For the Vietnamese it was a nationalist struggle. A war for independence.