Matthew Roberts... I've read it reported that Doc read from the manuscript in court--outlining how atomic bomb testing had caused mankind to suffer a nervous breakdown while also releasing "unseen forces of error"--but ultimately didn't submit it into evidence. Doc's appearance in The Great Soul Trial is compelling. While it sounds like his manuscript has nothing to do with the Dutchman, he equates the search for the soul with search for the mine: "We hunt treasure out here, as I said. Odd, but everybody looks at the same map, but they go to different places in the hills--all positive that they have it figured out right. And they get mad if they talk together, because one will call the other stupid, and so forth. I tell you, it's exactly like religion, and maybe that's why Kidd wasn't so far off, after all. The search for gold and the search for the soul aren't so far apart in a good many ways."
Have you read the manuscript yourself? I can't recall who it was that I spoke with at the LD Museum when I was there asking, but he said he's visit Doc, and Doc would read from it, and you'd feel sick for a few days afterwards. I understand Doc must have seen unforgettable horrors when reporting on the death camps and it sounds like The Kingdom of Reality was his way of putting that horror in some sort of context.
Thanks for all your help and insight.