The opinion piece is amusing, but poorly argued so don't feel like you need to read it. I just wanted to make my prompt available to others if they were interested.
Is sending your child to private school (or otherwise opting out of public schools) a good thing for public schools ("They still get my tax dollars and don't have to educate my child! They benefit!") or a bad thing for public schools ("The parents who opt out of public education are among the ones who would help improve education for everyone! They're being selfish!")?