Apparently, Megan McArdle's column is contagiously idiotic: meet guest-blogger Laura McKenna, who's thinly-disguised bigotry is given a patina of "We can't fix the problem so let's move on."
There's no way to go back to busing or 70s integration methods. Racism might be a factor, but the biggest problem is self-interest. People worry that integration will harm their kids and their property values.
One has a hard time discerning whether McKenna is talking about society at large or her own mind.