Finnis states that even the zygote is already a person and not merely a potential person. The zygote, embryos, and fetus all have the same status as a person does. Even if the zygote is only a few cells it has potential to become a person. To end the life of a potential human and a human have the same morality.
Tooley thinks that abortion is morally permissible. Tooley believes that a person