Smiley's People (1982 TV series) - John le Carré

And from there, he wandered off into an argument with Friedrich Schiller's grandiose statement that human stupidity was what the gods fought in vain. Not so, in Toby's opinion, and no excuse for anybody, whether god or man. What the gods and all reasonable humans fought in vain wasn't stupidity at all. It was sheer, wanton, bloody indifference to anybody's interests but their own.

But so many men learnt strength during the war, learnt terrible things, and put aside their knowledge with a shudder when it ended.

"We've had enough." He took back the report and jammed it under his arm. "We've had a bellyful, in fact."
"And like everyone who's had enough," said Control as Alleline noisily left the room, "he wants more."