Ironically, we all fall pretty much in the same lines when it comes to the ethical issue of killing one organism over the other whether you guys want to admit it or not. Arguments about souls aside, I think for the most part we'd all agree that a human life has more value than an animal...(I know there are a few people who I guess would disagree...but in the face of death, I bet many of those would swing towards valuing human life more than animals.)
As reefkeepers we make these decisions all the time. Usually we can all agree on what is a pest and what is not. And have no problem taking action to eradicate the problem. Sometimes the line isn't so clear, e.g. zoanthids running wild in a tank with no good way to frag them out.
The OP has/had a good topic worthy of discussion. I don't believe this thread was intended to be a religious discussion, although it can play into it certainly and I have no problem (at least currently) mentioning religion/god/etc. While questioning ones thought process on why they feel the way they do is okay, it is not okay to attack each other for the way they feel. I really don't want to ban all religious conversation from the board. I feel we are all mature enough to respect each other's views no matter how much or little you agree with them. So, please lets keep this on track and avoid attacks.