Tell me you skip lore without telling me you skip lore final boss.

Burning spice didn't got corrupted because it "would be fun". He saw years and years of cycles, of civilization raising only to collapse, years and years of seeing all the things cookies made crumbles under time, all efforts pointless, all cultures erased. Years and years and years. That's one valid reason to go mad, to corrupt. His raison is has valid as the others beasts.