It neither kills outright nor inflicts apparent physical harm, yet the extent of its destructive toll is already greater than that of any war, plague, famine, or natural calamity on record - and its potential damage to the quality of human life and the fabric of civilized society is beyond calculation. For that reason this sickness of the soul might well be called the 'Fifth Horseman of the Apocalypse.' Its more conventional name, of course, is dehumanization.
Ashley Montagu, The Dehumanization Of Man
ad-hominem, harm, racism