Why Did He Do It?

The money, the respect, the idea that he was fooling all these people who were doing better than him. I don't know, just speculation.

I choose to believe what I was programmed to believe

Well, when you think about it, it was inevitable. Put yourself in his shoes: No more Cold War. No more secrets you keep from everyone but yourself, operations you answer to no one but yourself. Then one day, you wake up and find out the President of the United States is running the country without your permission - the son-of-a-bitch, how dare he? And you realize, it's over. You're an obsolete piece of hardware not worth upgrading, you've got a lousy marriage and 62 grand a year.
- http://www.imdb.com/title/tt0117060/quotes?item=qt0414296


On a more serious note, you may want to check out this thread:
- http://www.imdb.com/title/tt0401997/board/nest/97437408

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Joe Satriani - "Always With Me, Always With You"
http://youtu.be/VI57QHL6ge0

He did it for the money. I'm a government employee and I could tell you the money is decent but it's not great. Hollywood movies would lead you to believe that people that work for the FBI's make a lot of money. I assure you they do not. If you read up on this guy he had a secret life that he grown accustom to. So he needed more money to finance it.

He admired Philby of Britain from age 14 and decided to accept the challenge of trying to do something similar. It was a lifelong goal.