Some of today's discussion is reviewed in these notes here; you can apply what's said there to our current issues:
http://ethicsandanimals.googlepages.com/lectures.htm#_Lecture_1:_Introduction
See esp.:
- What the Question Is Not: Not “Morally Right,” but Morally Permissible and/or Morally Obligatory
- Some Basic Concepts about Arguments: Introduction to Logic
- Moral Principles as Premises: Introduction to Ethics
- Religion and Ethics: A Brief Comment
