that the nazis in the diary were upset that they were being kept awake at night by the cries of starving Jewish children
I read about the Einsatzgruppen - first wave mass-murder squads that the nazis deployed as they pushed east & west, often rounding up anyone deemed undesirable in any village they came across and shooting them in a field.
This system of serial extermination was found to be inefficient, due to the fact that the goons doing it were getting traumatised by having to personally execute thousands of people. It’s part of what led to the gas chambers - a method of killing removed enough from personal involvement that nobody feels (as much) guilt.
Impersonal, remote airstrikes - especially via drones - are a normalised modern day incarnation of the same idea.
Oh man, this is up there with Dan Crenshaw’s “self-inflicted cumshot wound”