if you really want to destroy the most ethical people in your society, create a honey-trap where they are promised that they can do good for humanity but make it so that, actually, for every tiny benefit to mankind, they make sure it's contingent upon all sorts of complicated factors so the people who need it can't get it, & also have a lot of frustration and unnecessary paperwork. good people will shovel themselves into the meatgrinder, tread water as long as they can, and eventually burn out so bad that they can't do anything ever again.