Gavra: You surely know where flyers end up, most people not even bothering to read them, besides all practicalities involved. And the idea is to be specific for the mussar to be effective, not generalizing.
Most Unsolicited spoken advice & musser ends up in the same place, except that it has the added effect of getting people to want to do the exact opposite. No worries 🙂
P.S. Who says I was kidding?