There can be no permanent peace so long as the idea of crushing this or
that nation prevails. The question is not national, but international.
The nationalistic spirit of hate may be temporarily useful in stirring
up a country to fight better, but it does not tend toward a lasting
peace. In the study of war we should seek the causes, be impersonal, and
neither condone nor accuse. The scientific investigation of war comes
under the head of criminal anthropology, one of the purposes of which is
by knowledge gained to lessen or stop war permanently rather than
discuss the ethics of war involving the spirit of hate and vengeance.