Drugs, probably.
Firestarter is an amazing track when it comes on at 3am and you've been dancing for hours. In the cold light of day, not so much.
EDM of that era was very much designed to be experienced with MDMA and the KLF in particular really needed a stadium full of people in a similar state to fully appreciate them.
All the extra Discordian stuff was just icing. Hail Eris!
It's when the Prodigy had become mainstream and this was was dance/indie-rock crossover type track that they used to headline Glastonbury the following year. Pre-teens loved it - energetic and edgy... but really it wasn't subversive, just broadly available pop music that hit the top of the charts. If I went to a mid-90s techno or hard house event and they played this, I would have been as disappointed as if they played 2 Unlimited. Despite this, I still liked and went to Prodigy concerts and saw them at festivals.
I was, and looking back on it, its very nostalgic but some of the music hasn't aged well such as some KLF tracks. Early Liam Howlett (The Prodigy) tracks I must admit I find interesting just because of all the sources sampled and how it was worked with the hardware available at the time with a raw energy that I remember when I was 17/18