A Plague of Murder

There were many factual errors in the prologue—about what a serial killer is, about the history of serial murder, about the facts concerning the Jack the Ripper case, for crying out loud. But I held on.
Then the first chapter was on pornography and sexual serial murder. Oh, no.
In it, the authors actually stated that rape and rape-murder were not as prevalent when sex workers were more prevalent and brothers and sisters slept in the same beds. Seriously. More sexy time all ‘round, and rape, and I quote, wasn't worth going to the gallows for.
That's not how that works. I went to grad school for this, and I refuse to read further in a book that has this statement in it. It insults my intelligence.