NotFormer - “…for some reason the 70s and 80s was a very fearful time for parts of Christendom, including, it seems, the WT branch of it…”
A “Demon-Haunted World” (props to the late Carl Sagan) was a quick and easy explanation for what was - to repressed, ultraconservative religionists - a radically (and rapidly) changing environment that felt increasingly hostile to them, and where it seemed like everything they valued and spent their lives defending was being flushed down the toilet.
Not to mention the potential loss of cultural dominance that they (correctly) anticipated.