“war is a failure of imagination”
Alan Moore

I like the idea. But I thought the source might have been older than Mr. Moore, who’s noted for his comics over several recent decades (though he might be something approximating a polymath). There’s a site attributing it to H. G. Wells and another that says that’s the correct answer to a question about which quote H. G. Wells did not coin. Sheesh. My search is failing.