I am learning Prolog because I think I have an idea that I believe might actually be easily solved by Prolog instead of hacking it in some other language. I personally believe in learning paradigms of programming as far more important than languages. Prolog presents the very unique logic programming paradigm. Learning new paradigms always feels a bit mind-bending to me.
Edit: Actually, my last statement may be only in hindsight given that any experienced programmer will know or know of languages like C and Python that aren't mindbending, so one's viewpoint gets slowly skewed. I think that's why sometimes beginners find things like Prolog or other "strange" languages interesting or even easy, and that's because they present a paradigm that is more like like how humans think about certain tasks. Whether it's Prolog and logic, Elixir/Erlang and messaging, F#/Ocaml/SML with pattern matching, etc., these paradigms are actually quite natural to humans who haven't been tainted with paradigms like that of C, which takes on the paradigm of "let's think like a machine".
Edit: Actually, my last statement may be only in hindsight given that any experienced programmer will know or know of languages like C and Python that aren't mindbending, so one's viewpoint gets slowly skewed. I think that's why sometimes beginners find things like Prolog or other "strange" languages interesting or even easy, and that's because they present a paradigm that is more like like how humans think about certain tasks. Whether it's Prolog and logic, Elixir/Erlang and messaging, F#/Ocaml/SML with pattern matching, etc., these paradigms are actually quite natural to humans who haven't been tainted with paradigms like that of C, which takes on the paradigm of "let's think like a machine".