For instance, the CIA couldn't care less about BP. Now, MI6 surely did. Rather, the CIA influenced action against Mossadegh because it thought he was a Communist.
Whether MI5 convinced the CIA that he was a communist threat is the more critical question. Some have thought that MI5 simply convinced the CIA of such a story to take out their own bogeyman while keeping their hands clean. It certainly wouldn't be the first time.
Of course, whether or not he actually was one is less notable than his association and support for those who were, as well as his nationalization of the oilfields (technically not the nationalization of BP, but close enough).
1. Minus Israel....not that it fits my description.
1764 America was a subjugated colony of a monarch, I'd hate to live there. 1863 America was embroiled in Civil War, I'd hate to live there. 2017 America? Democratic global superpower, lots of room for improvement but I still love living here.
What about Germany? 1944 Germany was a fascist racist shithole. 2017 Germany is one of the leaders of the free world.
We don't control the past... shit happened, get over it. We learn, mature, and build the future.