I don't think this necessarily must be interpreted through the lens of abortion. It could also be speaking about those suffering outside of our "ties of blood" here in America. For example, those who "will never share our blood" might also be people suffering in the third world. The many millions suffering from starvation and war in other countries are indeed "trapped by obscurity" as so few seem to truly care about and identify with their struggle. This interpretation also seems to fit better with the themes of the album as a whole.
I don't think this necessarily must be interpreted through the lens of abortion. It could also be speaking about those suffering outside of our "ties of blood" here in America. For example, those who "will never share our blood" might also be people suffering in the third world. The many millions suffering from starvation and war in other countries are indeed "trapped by obscurity" as so few seem to truly care about and identify with their struggle. This interpretation also seems to fit better with the themes of the album as a whole.