From "Tolkien: A Cultural Phenomenon" (2003) by Brian Rosebury

This text is reproduced exclusively for the purposes of discussion on The One

[page 36] 

if ... Good and Evil are to be incarnated in individuals and societies, we must be convinced that the Evil side is what every sane man,
irrespective of his nationality or culture, would acknowledge as evil. The triumph of Good over Evil ... must appear historically possible, not
a daydream. Physical, and to a considerable extent, intellectual power must be shown as what we know them to be, morally neutral and
effectively real: battles are won by the stronger side, be it good or evil.


[i] W. H. Auden, 'The Quest Hero', N. D. Isaacs and R.A. Zimbardo (eds.), Tolkien and the Critics (University of Notre Dame Press, 1968) p. 51.