The reality, which politicians will never admit out loud, is there is a population of K-12 students who 1. will never become educated to any measurable standard, and 2. disrupt the education of everyone around them. You could give unlimited funding to a school, and these kids will not learn. You could assign a huge staff of dedicated top-educators to each class, and it won't make a difference. You could isolate them from everyone else, each individual into a dedicated classroom with that staff of education PhDs all to themselves, and they will not learn. They will either graduate high school not meeting the standard, or they will drop out before they graduate. You can't force education on someone whose parents, peers, and surrounding environment don't value it.

Yes, this has been my experience in my stint running an after school program. It’s an unfortunate reality that must be accepted in order to have sane policy.