Consider these two scenarios:
Parent(s) have a child. Mother and father realize they cannot feed the child, so they kill it.
Parent(s) think about having a child, but realize that they will not be able to feed it. They don't in the end.
Obviously one of these is pretty messed up, and the other is fairly normal. I'm wondering, how you can explain this from a moral/ethics standpoint though.
If you think about it from the perspective of an emotionless alien; the only real difference is that in scenario one the child got to live for a while. What am I missing?