Interesting point from a reader. It’s not defenestration per se which is bad, but who gets defenestrated and why that is the issue:

Jonah-
My first reaction was that you and Spuriell were right about the
relative diversity of opinion in left and right blogs. But on second
thought I’m not so sure. After all, WFB is rightly given credit for
being part of a big effort to purge the right of its more extreme and
distasteful elements. The left would do a lot better at convincing
me they are intellectually serious if they’d kick some of the
moonbats out of the tent.
Anyway, this is a rather unimportant argument unless you are Nyhan’s
landlord (or window dresser).