That's the book I meant. Good?
Murder and savagery has often personal, somehow perverse angle. Or homicides, which in their spontaneous elements can be even like black humor.
Or political assasination, with accurately executed target with purpose. Which is basically combat situation at purest.
But, at some moment, sheer magnitude of mass genocide or utmost cold and calculated extermination can remove the possibility of easy cheap amusement. Monolithic dimensions of pure statistics. And we talk of situation what is not about people in position of at least theoretical revolt against oppressor, but the bomb from the sky like hand of god.
It doesn't mean it would not be interesting. This monolith can be worth worship or disgust.