I think they got the cause/effect relationship wrong here. Do you think the neighborhood schools go bad because they leave, or do you think they leave because the neighborhood schools go bad?
Good question!
I think the last half of this article is searching in vain for any answer other than the obvious and painful (to liberals) truth... the public schools are in the crapper and caring parents will not accept it anymore, no matter the price. These are their children you're talking about. When push comes to shove, everyone wants to be a good citizen and contribute to the community but not at the price of giving their children a thrid world education.
The first part of the article laments (in suggestive tones and classist language) that parents who don't send their kids to public schools are greedy and only care about themselves rather than the community as a whole.
I'm not at all suprised that such a hit piece comes on the eve of the Supreme Court hearing arguments in the Zellman (Cleveland schools) case.