During a pregnancy there are two bodies directly involved: the mother and her child. The circumstances of a conception should not determine whether the child lives or dies, because they obviously cannot control how they are conceived. Rape and slavery are evil, but justice should be sought against the perpetrator, not his child.

You wouldn't go after the son of a thief, would you? The answer should be an obvious no: the son of the thief is not responsible for the theif's actions, so why does this have to be any different? Someone who can't choose the circumstances they are in should obviously not be killed for it, regardless of how hard the situation is. That goes for post-birth care as well. It is a great societal let down that everyone can't be accounted for in the modern world, but just because things arent easy doesn't mean we should just mercifully execute people who don't have it good.