During the Cold War a lot of the people who went into Russian studies and then into the government had a great love for Russia, but hated Communism.
Fuller, who started out studying Russia, may have been of that sort and moved on to trying to work out the same relationship to the Middle East and Islamism.
At any event, I wouldn't automatically assume that he was an Alger Hiss type.
I get your point, just not sure I agree with your analysis.
Nonetheless, there are far too many muzzies sympathizers in the upper ranks of our government. It skews their ability to be objective in regards to real threats. jmho