Prostitutes and Polygamists

Jacob and Solomon were polygamists. Tamar and Rahab were prostitutes. What are polygamists and prostitutes doing on the pages of Holy Scripture? And God told the prophet Hosea to marry a prostitute. What about Cain—did he really marry his sister? Abraham did, and he was also a polygamist. Lot offered his daughters up for rape, David committed adultery (or rape?) and the Bible calls both men righte...