I've always been dubious about PGP's web-of-collusion and signing-deniability-away, although it's a lot better than the automated authoritarian's wet dream that passes for CAs.
I loathe these ("everything which is not explicitly permitted is denied") security types, whose idea of nirvana is the cyberspace analog to re-writing the laws of physics so it is not possible to shift in your chair without written authority. Behind their keyboards they must make concurrent salutes to the Fuhrer, Baal and Jack Straw.