Civilization depends upon the vigorous pursuit of the highest values by people who are intelligent enough to know that their values are qualified by their interests and corrupted by their prejudices.
Man is always worse than most people suspect, but also generally better than most people dream.
We don't properly discriminate. We never discriminate properly when we're dealing with another group and one of the big problems about religion is that religious people don't know that they are probably as flagrant in these misjudgments as irreligious people.
Ultimately evil is done not so much by evil people, but by good people who do not know themselves and who do not probe deeply.