A few days back I climbed down rather on the George Monbiot advocates violence thing. Interestingly, Matt Ridley has recalled an incident when he was on the receiving end of one of GM's diatribes, which was delivered in the following terms:
Crucifixion wouldn't have been good enough for him.
... which does seem rather oddnow that George is calling for an end to vitriolic abuse and calls to kill people.