Dianetics has never been sold as "Science Fiction".lol Hubbard did write alot of Science Fiction and the simple explaination to your observation is that since most of what he wrote had been Science Fiction it was probably simply miss- classified. I have read Dianetics and it was a rather good book. Hubbard went off the deep end with turning what were some good concepts into a religion but he is not the first to make such a mistake. Overall Dianetics struck me as somewhat Jungian...
I don't know about that. Never? I've read, long ago when Travolta 'converted' about the original publishing in sci fi circles. Maybe it wasn't his intent, I don't know, but the connection remains.
Consider this recent article alone: Scientology: What it really is and isn't
Here is a quote from just this source:
Q: What was L. Ron Hubbard's background? A: He wasn't a psychologist or psychiatrist. He was born in Tilden, Neb., in 1911 and served in the Navy during World War II. As a member of the New York Explorers Club, he was credited with participation in several scientific expeditions. He was a friend of John Campbell, the editor of Astounding Science Fiction, one of the best-known magazines of the pulp era. Campbell, who became an enthusiastic advocate for Dianetics, published some of Hubbard's work in Astounding.
Overall Dianetics struck me as somewhat Jungian...
It struck me, the parts of it I am familiar with, as Jungian also, and rather a copy or treatise at that. And then Hubbard gets even wierder.