Since they were more rational already they could observe the rational approach had better outcomes. Irrational people presumably can't do that. You'd have to appeal to their irrationality to make a case for rationality and I'm not sure how that'd work out.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.