School's primary purpose is to prepare people to be functioning members of society.
Education is about teaching children how to think, communicate, and act as much as giving them specific tools for future careers. Never mind the plethora of studies that have found links between arts education and performance in other educational/vocational areas. It's hardly esoteric.
CS is incredible to teach how to think. Algorithms, using logic to solve problems, decomposing a problem, etc... Theses are all skills that make you think, that push you to UNDERSTANDS better. Personally I never seen my college classes as nothing else than learning to learn, because that's computer science. More often than not, the lack of information given by the teacher wasn't a proof of incompetence but a way to test our capacity to search and discover by our self.
Sure I learned a bit in my french classes, sure I learned a bit in my history classes, but I never ever learned to think in any of theses classes except CS. I only learned to apply theses skills.
It seems at least possible that this might be due to schools that are better funded tend to offer more arts education, and the better funding would also presumably increase the quality of the education in other areas. Without seeing the studies, it seems hard to conclude that the arts education is the cause of the better performance in other areas.
I can prepare almost anyone to be a functioning member of society so long as you don't want them to be capable of thought or creativity. They won't be a functioning member (or a well-functioning member) of a society ruled by a democratic system of government, though.
read: "productive economic units."