Vanilla Argument of the Week: Abortion

The following is an argument used by Trent Horn in a debate on the question, "Should abortion remain legal?"

1. It is prima facie wrong to directly kill innocent human beings, and such killing should be illegal.
2. The unborn are innocent human beings. 
3. Abortion directly kills the unborn. 
4. Therefore, abortion should be illegal.

The debate opponent was Professor David Boonin and was held at Stanford University. It can be listened to here. Trent also has a book on debating abortion, Persuasive Pro Life: How to Talk about Our Culture's Toughest Issue.