If you're hinting that American children wouldn't be fighting if a big bad invader like Russia or China came here, I believe you're sadly mistaken. Yeah the Vietnamese did some nasty stuff during the fight, but there shouldn't have been a fight to begin with. That's like when cops say that drugs cause all of these violent crimes. They don't. It's the fact that they are illegal that causes the crimes.
Alcohol is legal, and look at all the crime that is committed because people surrender their judgment to that. Did someone tell you that druggies just put flowers in their hair, and sit around singing Kumbaya?