If you defect you need to lick the boots of your new boss very hard. He defected obviously for money. I don't believe in high moral principles of people for some reason and especially in moral principles of FSB (or KGB) officers.

Politkovskaya is another case. I think she was simply crazy. I don't know what had caused this but I've heard many of her interviews - all I saw was a hysterical woman (really hysterical and not quite coherent sometimes).