It's pretty easy to hijack human desires. Destroy the family and give them something else cute to cling onto to fill that desire. Tell them if it feels good, do it. And tell them unborn people aren't REALLY people, so it's okay to kill them. Give it a few euphemisms so people disconnect the it mentally from a baby. Atrocities aren't carried out by a few psychopaths. They are carried out by the common people.