I believe Johnson understood that the reason was Vietnam. I also believe that he felt that if there was a way to communicate the real issues in Vietnam, that the reasons would be answered or understood. But there was just no way to communicate. ↗
Although I wasn't able to get a visa for Vietnam, I was able to talk with swift boat veterans to get a feel for the time and place, and I visited a tropical prison in the Philippines to get a sense of what a Vietnamese prison might have been like. ↗
You don't attack the grunts of Vietnam; you blame the theory behind the war. Nobody who fought in that war was at fault. It was the war itself that was at fault. It's the same thing with psychotherapy. ↗