I’m not usually in favor of killing, but I’d make an exception for the leaders of ISIS. I’d feel a certain satisfaction if they were wiped off the face of the Earth. This is a pretty typical attitude, shared even by many of my more liberal friends, even though, intellectually, it’s not something that we’re comfortable with or proud of.
Where does this malice come from? Psychologists have standard explanations for murderous feelings towards groups of strangers, but none of them apply here. I don’t think ISIS is a threat to me or my family or my way of life; I’m not driven by disgust and contempt; I don’t dehumanize them; I don’t think of them as vermin or dogs.
Rather, I am motivated by more respectable sentiments, by compassion, love, and empathy. Not for ISIS, of course, but for their victims. I have seen the videos of decapitations and crucifixions and have read accounts of rape, slavery, and torture. If I were less invested in the suffering of their victims, I would be more receptive to a balanced discussion of different options. But because I care, I really just want them to pay.
In The Theory of Moral Sentiments, published in 1759, Adam Smith observes that when we see someone harmed by another, we feed off his desire for vengeance: “We are rejoiced to see him attack his adversary in his turn, and eager and ready to assist him.” Even if he dies, our imagination does the trick: “We enter, as it were, into his body, and in our imaginations, in some measure, animate anew the deformed and mangled carcass of the slain, [and] bring home in this manner his case to our bosoms.”