So far as I can tell, practically all schools except for the "unschooling" ones and some others, exist to prepare students for life in the Prussian Army. (Believe it or not, this is what was behind the original organization of public schools. The fact that Prussia no longer exists is somehow irrelevant.)
It's rigid, hierarchical, and encourages rote memorization and acceptance of authority over original thinking. It does not prepare people well for today's fast-changing, innovative business environments or creative and original thinking.
It's why leading innovators, such as Paul Graham (founder of Y Combinator, the world's most successful startup incubator) basically favor turning the US educational system upside down.