Sadly, collateral damage will happen in a war and some US soldiers acted with psychotic impunity, but let's not act like the North weren't killing thousands and thousands of South Vietnamese civilians and basically committing genocide against who they perceived to be "bourgeoisie." End of the day, the North stated the war through clandestine operations in the South (some 40,000 Northern insurgents, your "Viet Cong," were terrorizing the South and fomenting revolt and instability: About 40,000 communist soldiers infiltrated the south from 1961 to 1963.[64]:76).
Agent Orange was a defoliant obviously used to clear forest to hopefully reveal VC encampments. What do you suppose we should've done? Click a couple of bottles and say, "Come out to play?" It made a lot of US troops sick, as well. Anyhow, how about the generations and generations of children the North killed and affected through their invasion and then reunification, which, as I said, set the country back decades? Why do you think Vietnamese fled here and didn't stay in the "worker's paradise" that was reunified Vietnam? The North was the "evil side" in this conflict. Did the US commit evil acts during the war? Sure. As have every nation during war in the history of the world. But we were on "the right side" in the war. There's no argument otherwise (although I'm sure some commie apologist historians would say otherwise).
The Iraq War was indeed a total moral wrong. But the Iraq War doesn't have anything to do with the Vietnam War, and it doesn't mean the US was always on the "wrong side." It also doesn't mean "we're the cause of all the world's problems" with regard to foreign policy. There's so many dumb myths and misconceptions about the US and various geopolitical situations that anyone uttering that statement is "uninformed," like "we armed Saddam!" No we didn't. The French did (fun fact, their opposition to the Iraq War wasn't out of moral good, but because they have done business with the Saddam regime since it began).
http://news.bbc.co.uk/2/hi/business/2757797.stm
Boiled down, everyone's nose in the , which is why it irritates me when people will prop the likes of Europe or whatever as peace loving hippies vs. the US's endless warmongering.