The very word "incest" makes most normal people's skin crawl. They don't want to hear about it. They don't want to know the details. Neither does the victim. His or her mind has often put up defenses.
It seems like there is another 99%, the apathetic. Do animals experience apathy? Apathy is not an emotion, but may arise from other emotions. I think it rode in on the back of bad '70s TV and music.
Mother Russia was enthralled with enigmatic Grigori Rasputin, for a little while. But he never lost the loyalty of tzar Nickolas or tzarina Alexandra. They just thought the nasty tales were rumors.