Jonathan Glover, 22 November 1990
Moral philosophy has not much changed in method since Socrates. Reasons given in support of opinions on moral issues appeal to principles, often about happiness or justice. Opponents of the principles use counter-examples to evoke intuitions which go against them. Some of the principles appealed to in support of abortion also justify infanticide, and some principles used by opponents of abortion also rule out contraception. These more extreme consequences go against the intuitions of most people. Those who care about consistency must either override an intuition, or else abandon or qualify the principle they used to defend or oppose abortion.