I feel instinctively that he is, at base, a decent man - who did a Hell of a lot of harm, probably with the best of intentions, given the fact that Tony was in charge and that he was blinkered by his belief in the 'Project'. So, culpable there.
I suspect that he looked at the Referendum results and decided against a possible defeat - he's not been enthusiastic about Parliament for some time after all. The Referendum speech was magnificent and was his finest hour - he should be honoured for that.