Cоnsider the fоllоwing pаssаge: "I guess it is eаsy for those who have never felt the stinging darts of segregation to say 'wait.' But when you have seen vicious mobs lynch your mothers and fathers at will and drown your sisters and brothers at whim; when you have seen hate-filled policemen curse, kick, brutalize, and even kill your black brothers and sisters with impunity; when you see the vast majority of your twenty million Negro brothers smothering in an airtight cage of poverty in the midst of an affluent society; when you suddenly find your tongue twisted and your speech stammering as you seek to explain to your six-year-old daughter why she cannot go to the public amusement park that has just been advertised on television, and see tears welling up in her little eyes when she is told that Funtown is closed to colored children, and see the depressing clouds of inferiority begin to form in her little mental sky [...] when you are harried by day and haunted by night by the fact that you are a Negro, living constantly at tiptoe stance, never knowing what to expect next, and plagued with inner fears and outer resentments; when you are forever fighting a degenerating sense of 'nobodyness'—then you will understand why we find it difficult to wait." This passage offers, primarily, evidence based on which of the following?