Yoosta-Bee Sunk Costs
It’s a generalization, and therefore subject to exceptions and qualifications, but this seems basically right:
If we discount the out-and-out hacks, my entirely unscientific impression that apparently smart1 pro-war bloggers who were/are genuinely right wing have been much more likely than apparently smart pro-war bloggers who were (or who claim to have been) left of center to accept that they were wrong and that their former comrades appear to be increasingly deranged.
Especially if you fold the Reynolds/Althouse “right-wingers who refuse to admit that they’re (at least now) right-wingers” into the mix, this seems right. Some initially pro-war liberals bailed either just before or soon after the shooting began — Yglesias, JMM, Drum — but otherwise among the “liberal hawks” or “decents” there have been very few conversions against the war comparable to actual conservatives like Cole, Sullivan, Bainbridge, etc. (Did Drezner support the war initially? I don’t remember and don’t have time to check.)
Another exhibit of both strands of the premise: Greg Djerejian on O’Pollahan.