For John le Carre, it was always who's betraying who: the hall-of-mirrors kind of thing. When you go back to the '30s, it's a case of good vs. evil, and no kidding. When I have a hero who believes France and Britain are on the right side, a reader is not going to question that.
Politicians were like talking dogs in a circus: the fact that they existed was uncommonly interesting, but no sane person would actually believe what they said