Abortion, unlike a miscarriage is not natural. When a woman becomes pregnant, her entire body accommodates the baby's presence. Her organs work for two. Her immune system goes into overdrive. Her hormones becomes master.
Miscarriages normally occur after the mother's body's accommodations have started to break down.
Abortion abruptly ends the need for accommodations and this interuption can be dangerous. People are under the impression that most illegal abortions were done by an old neighborhood woman using a dirty coat hanger. Actually, most illegal abortions were done by med-students or less than scrupulous doctors. Big business doesn't have time for doctor-patient care. Abortions are done and the women are sent home.