The Dissenter

#1243 Jeff McMahan: Antinatalism, Extinctionism, Gene Editing, and Overpopulation

13 snips
Apr 20, 2026
Guest
Jeff McMahan
Jeff McMahan, Oxford moral philosopher known for work on the ethics of killing, discusses reproductive ethics. He debates antinatalism and whether lives are worth starting. He examines abortion timing, extinctionism, gene editing versus embryo selection, and when population concerns could create duties to reproduce or not reproduce.
Ask episode
AI Snips
Chapters
Books
Transcript
Episode notes
INSIGHT

Three Pillars Shaping Abortion Ethics

  • McMahan locates abortion ethics on identity, interests, and moral status, tying permissibility to when a person begins and how strong fetal interests are.
  • He places personal identity around 22–28 weeks for initial consciousness and argues fetal interests before that are very weak.
INSIGHT

Fetal Consciousness Doesn't Grant Absolute Protection

  • Even after fetal consciousness arises, McMahan denies strong moral status for fetuses, so later abortions remain permissible in many cases.
  • He compares fetal weak interests to very elderly people with weak interests but without a moral status that bars killing without consent.
INSIGHT

Why Preventing Human Extinction Matters

  • Extinctionism follows antinatalism only if voluntary human extinction occurs; otherwise extinction harms existing people and prevents countless future good lives.
  • McMahan favours weak pronatalism: preventing extinction denies many potential individuals valuable lives and impersonal cultural goods.
Get the Snipd Podcast app to discover more snips from this episode
Get the app