We don't talk about the environmental impact or Axis casualties.
We won. That pisses off the dummies. That is the reason why they do not talk about WW2.
As an aside I have always maintained that the USA can seriously kick some ass when we absolutely have to. Problem is that starting in the 50's we lost that mindset and started worrying more about what the world thinks about us and enemy civilian casualties. When we go to war it should be with the goal of destroying the country we are at war with by any and all means possible, as soon as possible. Enough to make them incapable of mounting any resistance, organized or otherwise. When one is cold, starving, and outdoors, one does not desire to be an insurgent.
As far as the environmental devastation in vietnam... looks like that communist country is doing just fine. Mother nature's healing methods are without equal.