What I found a bit hard to believe was that all this resulted for him in was being made to resign quietly from UNIT. (And going on a trip to find himself, leading us to the last Three adventure.) Since Mike Yates was ready to accept the deaths of a lot of people for his Utopia here, and only balked because they were suddenly people he knew.

As for whether or not this was ooc for him: I would say we didn't see enough previously to know whether or not he harboured an inner radical revolutionary just begging to be awakened, because I don't recall conversations about his views. But as these were the 70s, they might have gone for an RAF parallel (that's Rote Armee Fraktion, not Royal Air Force), to people like Ulrike Meinhof and Gudrun Ensslin, as one of the most common reactions was "but with their background, who'd have thought?")