[hollerith]

Have you read even one chapter of the novel?

Although he is fascinated by the craft of spying (and I can see why some people might find that objectionable or regrettable) Le Carre does not engage in the moral stereotyping or moral certainty you describe.

Also, spies probably save lives: if for example the Kremlin had been more skilled at collecting and analyzing information about Ukraine's military capabilities, they probably wouldn't have invaded.