Update on A Delicate Truth by John Le Carré

Just re-read a 2013 Le Carré, which I had read and liked when it first came out, but had not been particularly struck by.  But this time, it hit me harder.  One of the prefatory quotes, from Oscar Wilde, was "If one tells the truth, one is sure, sooner or later, to be found out".  And without specific spoilers, the book deals with the aftermath of an operation gone very wrong and briskly covered up.  A key player, in both the operation and the cover up, is Jay Crispin, a trader in mercenaries. Here's an assessment of Crispin by our protagonist, Toby:

And for sure, wrestling with his disgust and anger, and determined as usual to reduce them to a manageable level, he gave due thought to Hannah Arendt's concept of the banality of evil, and launched into a debate with himself about where Crispin fitted into her scheme of things. Was Crispin, in his own perception, merely one of society's faithful servants, obeying market pressures?  Maybe that was how he saw himself, but Toby didn't.  As far as Toby was concerned, Jay Crispin was your normal, rootless, amoral, plausible, half-educated, nicely spoken frozen adolescent in a bespoke suit, with an unappeaseable craving for money, power and respect, regardless of where he got them from. So far, so good. He had met embryonic Crispins in every walk of life and every country where he had served: just never until now one who had made his mark as a trader in small wars.
In a half-hearted effort to find excuses for Crispin, Toby even wondered whether, deep down, the man was just plain stupid. How else to explain the cock-up that was Operation Wildlife? 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.