The 70's, 80's and 90's are sometimes called the "golden age" of serial killers. That's when Ted Bundy's reign of terror happened before he confessed to killing 30 women and Jeffery Dahlmer killed and cooked 17 men and boys.
Peter Vronksy is a criminal justice expert who says conditions are perfect for another "golden age" of serial killers to begin in the next decade or so. His warning is in his new book, Sons of Cain: A History of Serial Killers From the Stone Age to the Present