Eh, I'm a kind of Consequentialist. While Utilitarians say that the consequences decide what we ought to do, my position is that there is no scientific way to justify an ought. However, we can observe that people make moral judgments and a common pattern for those moral judgments are the consequences that affect a society. Clearly, a society can't survive and prosper if murder and theft is the rule.
The problem is when we run around and say that nature has these mighty laws, and that there is an imperative to follow them. It sounds a lot like religion when you do that. Relativists assert that it's all opinion. So if you think rape is right, then it's right. If you think it's wrong, then it's wrong. However, that doesn't solve anything either because obviously that's not how it works. Society's don't just form a consensus on subjective opinions and democratically issue that as their moral law. They're totally forgetting about the minority in power, and the pattern of morals having a practical benefit to that society given its political, economic and social conditions in the time their morals were first developed.
To contrast myself from Relativists, I don't consider morals as resulting from a consensus or just personal opinion. Rather I see them as a resulting from of a society's economic, political, and social conditions to serve the desired outcomes of the people living in that society. Yes the morals sometimes unequally benefit those who exercise power, but others like no theft or murder benefit everyone. Secondly, we can judge the actions of others. We can't do so because of some rules that exist in nature (that's [w00f!] religion), but rather we can due to our biological programming (e.g. murder ----> *scream*) and the practical benefits they may serve (e.g. no pork ----> food is scarce and pigs are an inefficient food source).
So Kemp, I want a moral theory that is empirically testable. The ones that name an ought and a principle to decide what we ought to do are not empirically testable and are just as irrational as religion. If I asked you to prove that we ought to do x from an experiment, you would not be able to. I'm assuming you agree that experience or observation should be our guide to what we believe, yes?