Framed around the question of consent, the argument turns on a basic distinction: consent governs actions, not the effects that follow from those actions. Pregnancy is not something a person is continuously “doing” in the way they are choosing to speak, walk, or drive; it is the biological result of a prior act. Because of that, it is not something a person can meaningfully opt into or out of moment by moment through consent in the same way as an ongoing behavior.
Recognizing this does not mean that someone who experiences an unwanted or difficult outcome should be abandoned. Medicine and social support can and should be used to help mitigate hardship, pain, or health challenges that arise after an action has been taken. The moral limit, however, is reached when the proposed solution requires intentionally killing another human being.
The analogy to treating a sexually transmitted infection is meant to clarify that boundary. Medical treatment is normally permissible, but it would cease to be so if curing the condition required pressing a button that instantly killed someone else. In the same way, withdrawing consent from pregnancy is not morally neutral if the only available methods involve deliberate lethal acts against the unborn human.
Abortion, on this account, is not merely declining to continue an action but using specific interventions that intentionally cause death: pills that cut off oxygen, surgical procedures that dismember, or injections designed to induce a fatal heart attack. Those actions go beyond addressing the consequences of a freely chosen act and instead cross into the direct killing of another human being, which marks the moral boundary the argument insists cannot be crossed.
Key Takeaways
Consent applies to actions, not to biological effects, and pregnancy is an effect rather than an ongoing action one can continually revoke.
Providing care after an unwanted outcome is legitimate, but “care” cannot include intentionally killing another human being.
Analogies to medical treatment show that solving a problem becomes impermissible once it requires directly ending someone else’s life.
Abortion methods intentionally cause the death of an unborn human, making them morally different from non-lethal ways of addressing hardship.