The "spawn" of a rapist is an independent being with its own genetic signature. Western society long ago discarded the notion that the sin of the father passes to the child.
While your rights argument does have merit in the case of a pregnancy that threatens a mother's life, inconvenience cannot be considered grounds for murder.
Your point about the sins of the father is totally irrelevant. The child's NEED creates in him an inferiority. A person who attaches himself to the blood supply of another, and draws nourishment from her, and causes that person GREAT PAIN, is not innocent.