Another Country: Histoire d'une trahison

Guy Burgess became a communist, spied for the Soviet Union, and lived there for the rest of his life after he was found out. Why? Because, as far as we can tell from this movie, he was a homosexual, and British law was extremely harsh toward male homosexuals. That makes no sense at all. Soviet law was also extremely repressive against homosexuals in those days. No one would have chosen the Soviet Union because they thought it was more hospitable for gays. Since Guy Burgess was a real person and this film is based on his life, he must have had some other reason for becoming a communist (he wasn't one in his school days) that has nothing to do with his sexual orientation. What was it? The movie doesn't tell us.