Science Fiction as a Genre
Detective Fiction / Noir is a genre, and we've seen it is a genre which lends itself to moral / existential themes.
Science fiction, often called speculative fiction, or, in Dick's case, pre-cyberpunk and beyond, is another genre.
What types of themes does science fiction, as a genre, explore?
Adaptation and Dick
One of the striking thing about Philip K. Dick's stories is that, like Chandler and Hammett's short stories in the detective fiction "pulps" before World War II were the basis of many many films and other books, many, many of Dick's stories in the Science Fiction pulps of the Vietnam War period are also adapted into films: Minority Report, Bladerunner, Total Recall, Impostor, Screamers, certainly an influence on Eternal Sunshine of the Spotless Mind...