Asked by host Chuck Todd, during a discussion of the Michael Brown shooting in Ferguson, Mo., about the fact that African-American communities like that one are often served by snow white police departments, he offered some perfunctory words about the effort to produce more representative cop shops. But then Mr. Giuliani took a sharp turn off topic and into the brambles. "I find it very disappointing," he told Mr. Todd, "that you're not discussing the fact that 93 percent of blacks in America are killed by other blacks. ... I would like to see the attention paid to that that you are paying to this."