In order to treat certain groups and its individuals badly on principle, a person must take the attitude that the the recipients of the discriminating behavior are inferior or unalterably similar in some respect (immorality, weakness, etc). Effectively, all discrimination has its justification in stereotypes. Utilizing earlier examples, for the entire history of black slavery and widespread racism, African Americans were seen as bumbling simpletons, who shuffled and slurred their words. When sexism was the norm, it was said to be for the good of the oppressed, who were written off as to weak willed and sentimental to function outside of the home with skill. Where the desperate struggle for riches is not involved, nobody has ever faced down discrimination in the absence of stereotypes. In the end, to sustain hatred in the presence of overwhelming evidence of one's own wrongfulness required extreme stubbornness, and the means to justify it.