Education is also self selected, so it likely representative of other choices as well.

It just isn’t though. Opportunity is not doled out equally. Yes, everyone has the chance to be educated. But some schools are better, some families more supportive etc. And certainly there are exceptions that defy their environment but they are exceptions.

That doesn’t distract from the fact that many that have the opportunity chose not seek or continue higher education. This is especially true post collage.