I can speak only of my own family's experience during that war. My Grandfather was an Army surgeon in the Pacific Theater. I had almost no knowledge of what he did and saw in that war until after he died, when I read his diary of the war, as while he was alive, he never once spoke of it to me or even to my father that I know of.
He, along with many, many other soldiers in both theaters, saw and did things that were both horrible and seemingly impossible. To come home from such death and destruction to a country with a thriving economy, no war damage or experience, and massive celebrations treating them as heroes (rightfully so), I think it was very difficult for many veterans to adjust. They couldn't reconcile what they had experienced at war with life at home, so they simply buried it. I have heard that from many other historians as well, that soldiers came home from the war and never talked about it again. Some until their deaths, but many until much, much later in life. I think that's because there were no words to explain it to those of us that hadn't experienced it. At least, no easy ones.