There are two races of men in the world, but only these two – the “race” of the decent man, and the “race” of the indecent man. Both are found everywhere; they penetrate into all groups of society. No group consists entirely of decent or indecent people. In this sense, no group is of ‘pure race’ – and therefore one occasionally found a decent fellow among the camp guards.
– Viktor E. Frankl from the book Man’s Search for Meaning