Most people swept up in warfare would avoid brutality & violence. They're pressed to participate, under threat, to support one or another group.
Count your blessings if such choices are not forced on you -- when a bad choice may mean death.
We know ways to defuse rivalries and to minimize sectarian turmoil. But belligerent leaders and assorted parasites make trouble, seeking to scavenge gains.
Rejoice you've not had the misfortune of Hitler & his minions coming through your door, demanding lunch.