So with that having been said, and recognizing my own role:
Why exactly should we sympathize with parents who react to problems in their school systems by using their economic leverage both to exempt their own kids from those problems and also, by altering the tax base for their original school system, making those problems worse? Why is that praiseworthy? It doesn't seem praiseworthy to me. It seems to me like just another of those little pragmatic immoralities we all undertake regularly.
We have few problems seeing the problem when it takes the form of kids going to Choate and Bowdoin. But at the smaller scale we all deal with, we seem unable to recognize the same thing happening. We seem to believe can't possibly be a part of the problem. But, of course, we are.
I don't mean to crucify anyone for doing it. After all, I did it too. But I think we can reasonably draw the line at rationalizing or valorizing the de facto privatization of good public education in our country.