I’ll never understand why killing a baby is the right thing to do
How about if you wife was going to die, and the baby was not going to live or had monumental health complications?
You really gonna choose that life? You are gonna tell your wife that she has to die? You want to be a single widower with a severely handicapped baby who will destroy your life financially, if they even live. If you decide you are then that's your right.
It's not your right to tell someone else that they have to do that.