If what they want to do is to mess around with horrifically cursed items... I say let them. Build a whole campaign around it. Say that news of their exploits has spread and they've become legendary, even if falsely so, for their ability to seal dangerous magic items. Have nobles seek them out as damage control experts, sending them in to deal with the nastiest evil items in the land. Use their natural proclivities to make them heroes, whether they like it or not.