Answering your edit: don't people have to come to this conclusion on their own, rather than be "convinced"? Doesn't someone have to pass through some period of anhedonia, and the realization that "things" aren't going to make them happier, before they can start to see the structure that will help?
If so, and if your desire is to help normal people, I guess your choices are to a) find a strategy that sells anhedonia against the formidable marketing budget of pretty much everyone, everywhere in this culture, or b) capture them on the other side and offer them the structure they need to build a life after anhedonia.
75% of these Robert Pirsig quotes [1] seem relevant, in some way.