Why was Lt. Caley prosecuted for the killing of civilians during the Vietnam War but President Truman was not, when he dropped a nuke on a city of civilians (twice) during world war 2

Primarily because it was decided (determined?) that the villagers he destroyed were not the enemy. If he was told they were then he was unjustly tried - much higher decision makers should have faced trial which I think most people believe is what happened; he was a scapegoat.
The Japanese citizens, by faith in a divine Emperor, were the enemy (and there is proof they would have fought to the last person - which is a very unusual threat in any war.)

There were NO innocents in NAM....

a 5 year old girl walking with her grandma would wipe out a squad as fast as an NVA company.

What Calley did was right.

The trial: It was only pandering to the bleeding heart liberals and hippies back home.

CLICK HERE for more info on MyLai and Lt. William Calley

http://www.law.umkc.edu/faculty/projects/ftrials/mylai/mylai.htm


This is something I always had to scratch and wonder about. Here we had soldiers in a war we had no business being in, in a country with people who would be your friend by day and your enemy by night. And how was the soldiers supposed to tell the good from the bad under those conditions.

It is understandable how we had so many soldiers come back from Viet Nam so screwed up. Agent Orange exposure, fighting under the worst set of circumstances imaginable. A war with no objective, no direction. A war that created a whole new culture back home. A culture that extends to this very day.

Lt. William Calley, I feel was a scape goat. There is no denying his involvement in the My Lai massacre. But it would appear he was "made an example". And for what??? To satisfy the anti-war crowd who tried to make life miserable on returning veterans???

Things got all turned around in this war. Soldiers were sent to serve but not allowed to fight. In the end, this turned out to be a war with no purpose.