I voted NO. Abortion can only be considered when pregnancy endangers the mother's life. A son of a rapist is innocent. The son shall not die for his fathers' sin, says the Torah. And please don't say that rapism is genetic, even if it were nobody is guilty untill he actually commits the sin by himself. If the child were guilty, then we should kill every person whose father is a rapist!!!!! Absurd!!!!!
According the Orthodoxy abortion can not be considered murder, but a crime against life, though. But for Noahides there is no distinction. Sfichut Damim includes all crimes against life. However a Goyah can also abort if her life is in danger.
Regarding the psak of the Torah about a pregnat woman there is a Karaite different interpretation. They say, if the hit woman gives birth before time and the child survives, then it is a fine, if the child dies, then life for life.
Hope it permitted to post a Karaite interpretation in this forum. After all, Christians are allowed to post althogh they are not considered to be Jewish.