At it's heart, FIRE is a reaction to how tenuous, unsustainable and unstable the job market has become in recent years. I don't particularly want to sit on the couch and binge Netflix, but I have such low faith that I'll be able to maintain decent employment that won't destroy my physical and mental health till the age of 67 that FIRE is a completely reasonable thing to aim for. The only unreasonable thing is the core assumption that past performance is a guarantee of future results. Oh well.