I believe that the pragmatic concerns over womb police are realistic though probably not immediate. We are pointed in the direction of Red China with its community watchers on each block who try to track the menstruation or midriff of young women in service to population control. But pragmatism won't do. It is serviceable only when linked to an adequate theology. It cannot stand on its own.
Abortion is wrong because it is the intentional killing of another human being.
It is murder under the sixth commandment. Intention is an important element in murder. A tool known to kill, such as a curette or a prostaglandin, is another important element. Neither of these elements are normally present in the case of a newborn with cocaine in his blood. The majority of newborns exposed to illicit drugs are not measurably damaged because of the exposure.