So wrapped up in the confusion of espionage and without the real emotion to feel his actions are coolly paranoid and agenda-based. Whereas Turing uses his heart to make a moral distinction, Greene examines the logic of the situation and makes his best guess on the back of this logic. Greene is the patriot doing right. It is only his religious conviction that allows him to deal with angels . As with his reaction to love it is doubtful that there is much heart there.
Heller is much the same.
Heller is very malleable. The Doctor capitalises upon this. During War he is quite a strategist. Probably would have come a long way had been accepted into the forces. And, indeed, The Turing Test is another force to be reckoned with.