Full Idea
Achieving unconditional surrender can never be a justification for the continuation of war, since there are always conditions that a vanquished adversary, no matter how evil, can be justified in demanding.
Gist of Idea
Unconditional surrender can't be demanded, since evil losers still have legitimate conditions
Source
Jeff McMahan (Killing in War [2009], 3.3.1)
Book Reference
McMahan,Jeff: 'Killing in War' [OUP 2009], p.130
A Reaction
McMahan is particularly discussing Hiroshima, but this also applies to the European war in 1945. Presumably a civilised victor will grant the conditions which the losers would have demanded, and that probably happened in 1945. It's about power.