Capitalism self-selects for those in power to be the most monstrous members of the bourgeoisie who rise to prominence through their sheer ruthlessness and disregard for human well-being. That or they inherit their wealth and are brought up and their personalities shaped by those same bourgeois.

The people in power are then held up as positive role-models by society at large, and that leads to common people imitating them. Has Elon Musk, Jeff Bezos, or Bill Gates ever killed a cat or other small animal? We probably can’t say for sure. WOULD they kill a cat or other small animal if they thought they would benefit? Without a shadow of a doubt.

There’s also obviously an element of the default (white) american perspective being that of the petit-bourgeois colonizer, and if one identifies with that perspective then they identify to some extent with all the mass murder and violence that that entails.