Because education alone in a vacuum won't fix the issues.

Even if the current model was working, just continuing to invest money in it while ignoring other issues like early childhood nutrition, a good and healthy home environment, environmental impacts, etc. will just continue to fail people.

Schooling alone isn't going to help the kid with a crappy home life, with poor parents who can't afford proper nutrition, and without the proper tools to develop the mindset needed to learn (because these tools were never taught by the parents, and/or they are too focused on simply surviving).

We, as a society, need to stop allowing people to be in a situation where they can't focus on education because they are too focused on working and surviving.