Bertrand Russell said this quote

“ In the Second World War he took no public part, having escaped to a neutral country just before its outbreak. In private conversation he was wont to say that homicidal lunatics were well employed in killing each other, but that sensible men would keep out of their way while they were doing it. Fortunately this outlook, which is reminiscent of Bentham, has become rare in this age, which recognizes that heroism has a value independent of its utility. The Last Survivor of a Dead Epoch ”