You obviously value education or your wouldn’t pay the private tuition for your kid…but it sounds like you are advocating for no tax funded (public) education for k-12 because it is a bad ROI, which would leave only private educations which are a financial burden to you and probably out of the realm of possibilities for most families.
I think this desire to reign in spending to make sure we find a way to do it effectively holds regardless of one's belief in which particular education we are thinking about funding. You wouldn't start throwing more money at a problem until you understand what is going wrong and have a suitable plan to fix and and witness the managers of the money are acting accordingly.
The main reason education is so expensive for a toddler is because of government intervention, such as childcare ratios and regulations regarding the facilities and licensing. If I lived in Idaho (the only state in the nation which has no such government regulation) it would be significantly cheaper.
Agreed, I am not a proponent of government guaranteed student loans and you're 100% correct they are an example of government gone wrong at the expense of both the student and taxpayer.