The author gives a lot of examples where this is a bit ridiculous... But I do think sometimes it is true that people are just too dumb to make their own informed decisions:
- consumption of tobacco products (people just need a tax nudge)
- consumption of junk food (people just need a tax nudge)
- seatbelt laws (I disagree with the author here)
- vaccination (I know I won't be making any friends here, but empirically, layfolks just don't have the capacity to make an informed decision)