What does the author say about the Martin Luther King speech in the introduction of the nonfiction book, Locking Up Our Own?

In his introduction, the author refers to a speech often given to young, black, male offenders by a particular judge ("Judge Walker") in which he uses the goals and values of civil rights activist Dr. Martin Luther King as an example of the sort of life said offender should aspire to. The speech is described by the author as having degrees of variation depending on the offender and the crime, but generally covering the same ground and also generally not having the desired result - to convince the offender to change his / her ways.