Druids can use steel armor and weapons if they personally forge them out of bog or Telluric iron.
(Meta-headcanon: the origin of the ban on metal armor was due in part to the fact that as residents of the industrial Upper Midwest, Gygax et al had seen firsthand the environmental devastation caused by iron mining and steel mills.)
Werewolves aren't actually evil, they are just victims of a propaganda campaign by Big Livestock.
Zombies groan and limp because they are cramping up from dehydration.