Principled folks whose libertarian bona fides are beyond question have sided with the Bush WOT view. And Stephen Green, mentioned in the linked post above, is one of those with nothing to prove. Add in folks like Randy Barnett, whose classical liberal street cred is . . . er, was impeccable. Ronald Bailey and Michael Young, both of Reason, have also been appreciably more pro-intervention than most of their colleagues (and have likewise been tagged a "libertarian imperialists").
The point is, you can excommunicate over just about any issue -- including, for example, abortion, a subject that classical liberal godfather Nat Hentoff dissents on. I don't mean to say that, next thing you know, you're airbrushing them out of the class photo, but you get the idea. We can all get together on the free markets stuff, but some of us think terrorism is a clear and present danger. Can we proceed from there?