what should i even say?

[Esquilax]

Indeed. But let us suppose for the sake of argument that I don't agree. That I feel the symmetry and "natural justice" of an eye for an eye makes my position the moral one, and that your position is naive and illogical, based on a concept of the value of life which has no basis in nature, where the cruel law of survival of the fittest rules supreme.

I've made a case, and so have you. Besides that your version of objective morality is the one you happen to believe, what makes it more objective than mine?

Well, there we get into the business of presenting argument and evidence. It's not hard to do; leaving aside the obvious flaw in the way you've presented survival of the fittest (it's not a moral concept and even if it is, it doesn't quite work that way in humans. ) there's still the matter of internal consistency, as it applies to you yourself.

Do you want to die? No, I doubt it. Most everyone feels that way, it's written into our biology. Given that you value your life, and you can predict that the majority of others do as well- not to mention the obvious utility of experiencing things versus gambling it away on a potential afterlife- then it's fairly simple to include the taking of life as an immoral act.

Now, you basically have two ways of going about that; either you can extend the "please don't kill me," premise over the rest of your species, upon which time you've gained an internally consistent moral principle (subject to adjustment for context, of course) or you can expect it to be fulfilled for you, but not for anyone else. At that point, you have an inconsistent moral position, which therefore fails as a logical position. Special pleading is a fallacy, after all, and I doubt one could make the case for being allowed to kill whomever they wanted while preserving their own life.

But what MAKES them more or less right than each other? Is it the degree of correlation with the universal truths? Or is it simple consensus?

The former. Granted, when it comes to the vegan issue you bring up, that's a more complicated discussion, and one where I wouldn't terribly mind a bit of speciesism rearing its head, since we're the only species capable of this level of consciousness... that is an enormous argument we're skirting around, though.