It is a tribute to the civil rights movement and its recent incarnation as Black Lives Matter that, according to recent polls, a majority of white Americans believe that Black people are not treated fairly in our society, not only by police but also by other institutions. In fact, only 10% of American voters believe that racism is “not a problem at all.” Among those who hold that opinion, 91 percent voted for Donald Trump. If you want to understand know how people can be blinded by hatred, “No Way Out,” a forgotten gem of a film from 1950, now available on YouTube and DVD, offers some valuable clues.