My kid is in college. I pay for her education. I continue to pay taxes to fund DPS, even though she no longer attends. I paid to fund DPS for the 9 years she attended. I paid to fund DPS when my daughter spent her k through 3rd years in Waldorf, which I also paid for. I paid to fund DPS before my daughter was old enough to attend school, and of course I paid to fund DPS before she was even born. Every adult who is not homeless does the same. 

We do this because we believe that assuring that everyone has the right to an education without restriction. We understand that educating our youth makes us stronger as a society and benefits everyone regardless if they have children or not, or whether their children personally attend public school or not. 

It is unfair, and the height of self-entitlement to believe one can live in and benefit from a society without contributing to the betterment of said society.