Abortionists could care less about women - they don’t hate them violently. Jack left these women like fully gutted deer.
He wasn’t after money, undesireables reduction (not enough victims) or stealing souls from God. He was just psycho hateful.
This relative needs to get a life - his own.
If the women died from complications from an abortion, an autopsy might discover the cause and point police to looking for an abortionist doctor -- unless the body was so mutilated that no such autopsy finding could be done.
I'm not saying I believe the story, but it seems as plausible as many explanations I've heard.