We extend our compassion selectively. When we feel secure and prosperous, it’s easy for us to look benevolently at our great big human family and want to give hugs all around. But man, as soon as things start to get scary or scarce, we’re locking our doors and buying guns.
The line between “us” and “them” is always being redrawn in our individual and societal psyches. In times of conflict, the line becomes a fortified barrier and those who fall on the “them” side of it loose any resemblance of kinship to those on the “us” side. When we loose sight of our commonalities with “them”, compassion is the first casualty.
The first goal of any skilled propagandist in wartime is to paint the “enemy” in the most alien terms possible. They become the “worst of the worst”, an existential threat to all that is good and true, undeserving of our compassion. It’s only when you can get a people to lay their compassion aside that you can lead them into all out war.
And then we’re astonished to see atrocities in our newspapers.