[Targan]

In my last campaign the ways that the PCs and their minions reacted to war crimes depended on whether the war crimes were perpetrated by themselves or by others.

In the case of war crimes perpetrated by themselves they would sometimes respond by having a little celebration, holding a debrief to determine how they could have done the job better, use the aftermath as an opportunity to engage in more war crimes that were or were not related to the initial depravity, or (rarely) engage in a little self-reflection and talk about how not to let things get out of hand in the future. Sometimes they would revel in their behaviour, sometimes they would admit among themselves that their actions weren't admirable, sometimes they would be in collective denial and try to pretend that nothing happened or that they weren't responsible.

In the case of war crimes not perpetrated by themselves they would often express self-righteous outrage and vow revenge on those responsible but whether or not that was the case they would usually try to find some angle in the aftermath that would benefit themselves. Sometimes they would do a little investigating of the incident and see what they could learn from it (both to gather intel on their enemies and also to better learn the arts of terror and depravity). On more than one occasion they were so impressed by the crimes of others that they would incorporate what they had seen into their own modus operandi.

Upon reflection, I'm kind of glad that campaign is no longer active. It was kind of depressing to GM.