Why are people not arising interest among the police force and or getting prosecuted for crimes they write or sing about?

Colton Simpson, who wrote "Inside the Crips" WAS put on trial for crimes he wrote about in the book, using the book as evidence in the trial. In 2007, he was sentenced to life in prison on California's 3 Strikes law. The book came out before this happened, of course, so does not tell about it. Tell-all autobiographical books are dangerous to write, because they CAN be used against you. As far as hip-hop and rap songs talking about crimes, those are mostly presumed to be lyrics, like poetry, and are not to be thought of as being autobiographical. Song lyrics often tell a story, but we do not think that the songwriter had all those adventures him or herself.