We, as enlightened observers, know the benefits of debuffs. A lot of times our parties were carried through extremely difficult dungeons with speed and def break debuffs. Sure your OP character can carry you for a bit, but eventually you have to craft a team with beneficial buffs and debuffs. But we can't expect the villagers to overcome years of stigma based on little to no fact. Sure, they're dumb, but they logically should be dumb.