This would make a great reverse-perspective story. The peaceful Morlocks going about their life with their ranch animals above, when this alien arrives with strange weapons (matches), frees their livestock, starts killing them and ultimately destroys their city.

Great movie

The Morlocks are smart enough to build a factory, but they're not good fighters and they seem to be easily defeated when the Eloi resist them. All the Eloi needed was leadership and more knowledge (preserving the library would've helped) ---then they wouldn't need the Morlocks.