The root of government is the organization of society. The root of politics and politicians, in government, is power. Power is a means to wealth. Knowledge is the offset and access to both power and wealth.
That is why some seeking or protecting wealth and power often seek knowledge as well. Others abhor knowledge's ability to stymy pursuit, or protection, of wealth and power.
It is in the best interests of any society to educate everyone, because potential can't be known till it can be expressed.
None but government has the means and motivation to accomplish the education of everyone. It is a large, expensive and long term (from pre-k to post Doctoral) investment that for-profit businesses will not undertake.
Even if you aren't in, and don't have children or grand children, etc... needing education, it is still in your best interest to invest in the type of society that can happen only when everyone is educated as well as is possible. That is the only type of society that has a history of shared, reasonably universal success.