Therefore Bill Gates is not homeless. This is an example of a sound argument. Abortion is the killing of a fetus. Therefore abortion is wrong. Every woman has the right to decide what happens to her body.
Abortion is a procedure which involves the woman s body.
Therefore, every woman has the right to decide to have an abortion. This argument is harder to analyze logically, which shows that I should have chosen a more straightforward example. It is invalid, as I originally claimed, if we understand the first premise as saying that every woman has the right to decide only what happens to her body i.e., if a woman has the right to decide on an action, then that action is one that is happening to her body. I think this is a natural way to understand the first premise. However, I agree that the first premise can also easily be read as students in class read it as saying that if a particular action is to happen to a woman s body, then the woman has the right to decide on that action.