FTA: Let me be clear. Violence is widespread and, sadly, deeply human, just as the adaptation for violence under certain circumstances is similarly ingrained in many other species. But war is something else. It is a capacity, and involves group-oriented lethal violence. Thus it deserves to be distinguished from rivalry, anger, ‘crimes of passion’ or revenge, or other forms of homicide. To engage an absurdly positive simile: violence is like marriage, in the sense that some sort of process whereby adults solemnise their relationship appears to be a cross-cultural universal, and is a likely candidate for being an adaptive part of human nature. War, on the other hand, is like arranging a wedding with a bridal shower or bachelor party, and laying on a hotel ballroom, an orchestra, a four-course meal and dancing. It is safe to assume that neither employing a photographer, serving a multi-tiered wedding cake, enlisting bridesmaids nor tying baby shoes to the bumper of the newly-weds’ car spring from the human genome, although people are capable of doing all these things. By the same token, plain, old interpersonal violence is a real, albeit regrettable, part of human nature. War is even more regrettable, but is no more ‘natural’ than a bridal shower or the assembly line used to construct a stealth bomber.