Huh, the usual reasons I hear for why abortion is ethical is that either (a) the fetus isn't a person and has no rights, or (b) the woman's autonomy rights trum

Huh, the usual reasons I hear for why abortion is ethical is that either (a) the fetus isn't a person and has no rights, or (b) the woman's autonomy rights trump any rights the fetus might have. (a) indicates the monkey procedure was ethical, while (b) is a little more iffy. But you're right, the argument (c) the woman's autonomy rights trump the fetus's rights but only when the fetus was unintended does indeed indicate the monkey operation was unethical. I'm not so sure that (c) is a very logical position though.