If people do not know what is going to make them better off or give them pleasure, then the idea that you can trust people to do what will give them pleasure becomes questionable.

Groups tend to be more extreme than individuals.

If owning stocks is a long-term project for you, following their changes constantly is a very, very bad idea. It's the worst possible thing you can do, because people are so sensitive to short-term losses. If you count your money every day, you'll be miserable.

If individuals are rational, there is no need to protect them against their own choices.

Clearly, the decision-making that we rely on in society is fallible. It's highly fallible, and we should know that.

I would not advise people to buy a car or house without making a list. You will probably improve your intuitions by making a list and then sleeping on it.

Poverty is clearly one source of emotional suffering, but there are others, like loneliness. A policy to reduce the loneliness of the elderly would certainly reduce suffering.