Marquis says that Thomson needs to address the issue of whether a fetus is a person

Marquis says that Thomson's violinist analogy can only be applied to cases of rape, and isn't applicable to abortion in the case of consensual sex

Marquis says that Thomson doesn't properly address the distinction between killing and letting die

Marquis doesn't say anything about Thomson's argument

Marquis says that Thomson's argument is successful in showing that abortion is sometimes permissible