No matter how curious you are, you tend to benefit from learning from others. There is more to university than learning from books. You wind up being around folks you wouldn't otherwise be with. For some folks, it is their first experience being without supervision. And stuff like that. It doesn't need to be university for all so long as there is some sort of schooling that meets these needs for folks. We can start doing adult-lite at 15/16 and have people move into dorms their last couple of years. Doesn't mean that a lot of folks wouldn't benefit from university or something akin to it: A chance to have an intensive course learning another language, for example, with the goal of fluency.
You can't force anyone into being kind, and some folks are simply going to be sour. We do start teaching folks as children, after all. Make peace with the fact that some individuals aren't going to be: That's OK so long most folks are and it shows in society and programs that help others.
Realistically, the basic information will be similar (basic science, health, reading, history, and so on) but we'll have different areas of interest and skill, so the exact subjects will be individualized to an extent and will definitely change over time as the world changes. You can't say for certain that psychology will make you better educated, but an introduction to the basic field might open someone's mind to being educated in that field, which helps society at large. Other things will be more esoteric: Go to art school, work in retail, and happily make art doesn't have the same sort of immediate payback - but chances are, they are more likely to be a bit compassionate just by having the education.