These girls or women can carry the babies to term, then put them up for adoption because there just aren't enough (white) babies to be adopted by loving families. It doesn't matter if these children have to go into (state funded) foster care for the rest of their lives if not adopted. Maybe they'll get lucky and not end up in a foster home where bad things happen to them. Maybe once they find out that their granddaddy is their daddy too (or their pop is a rapist), they won't have emotional issues that plague them and future relationships for the rest of their lives.
See, it all works out perfectly for that spared life once the anti-choicer's see them through birth and then don't give a shit about them afterwards.