Gay Marriage - are you for or against it and why?

[corndog36]

I would have to say that a flawless concept of morality would be based on fundamental principles of right and wrong.

Does such a thing as a set of internally consistent fundamental principles of morality exist?

I think so. This thread might be a better place to discuss this further; Evolution of morality.

Morality is a side-effect of the fact that those of our ancestors that were better at working in groups were more likely to survive and reproduce.
With that in mind, it seems to me like it would be silly to suggest any such "fundamental" principles.

Imagine a species on another planet evolves a morality with different rules. How could you judge which, if either, of the two systems is fundamental?

I think it is a side-effect of sentience. We make moral judgments about animals and aliens. (In your hypothetical example.)

I think you're missing the point, which is that you have no objective way of deciding that the conclusion is wrong.

This is where we are at in the other thread. I think it is possible to arrive at objective moral conclusions, if your moral model is sound.