The Toxic Avenger/Fridge

• Fridge Logic:
  • In the first film, it's explicitly shown that Toxie's "Tromatons" will force him to uncontrollably attack and kill villains even if he doesn't know that they're evil (if he ever learns why he killed the "sweet old lady", it's never shown on-screen). So why, in the third movie, is he directly helping the villains take over his hometown without being aware of it?