No, that's not what I meant. By a "set of rules" I implicitly meant a moral code. "Morality" is one of those important sounding words that stand for something much less grand and often simpler in concept. I wasn't talking about legality specifically either, as laws themselves (at least in a democracy) stem from the prevalent moral code in that society.
As for the examples you brought up, they don't really deal with moral relativism, or even with morality itself, since those are all discussions of details. Everyone will agree that killing a human being before it's born is wrong. The question in that particular issue is, when exactly does the embryo become a human being? The question of gay marriage is a question of semantics, mostly, as some feel that a same-sex union shouldn't appropriate for itself the name "marriage". Global warming? Well, the scientific community itself can't seem to agree about that. And as for wars... that probably deserves a thread of its own.
No, not really. Does watching sunrise make you automatically understand how the Solar System works?It is apathy because by claiming "respect" towards other moral outlooks that might be in direct conflict with yours equals to shrugging and walking off. It is also the easy and convenient thing to do when confronted with a situation that puts your integrity on the line. This brings up the point of the meaninglessness of integrity in moral relativism as well. A moral code is not something that just you will go by. It is something you believe in and will try to uphold regardless of circumstances. If you won't fight for your principles, what is there left to fight for?
This is a flawed example. It's the same as proposing we have sharks be prosecuted for attacking and eating swimmers. Human moral codes are meant to apply only to humans, since as I said before, they are just a set of rules meant to ensure that mankind can ultimately progress as a whole.
But yes, regardless of all that, I wouldn't allow a female to devour a male in my jurisdiction, because under my standards, killing a sentient being for no good reason (you haven't stated that there is a biological or sociological need for this... just inertia) is wrong. Sentience entails being able to overcome and control one's bodily urges. But I digress.
Yes, stating the obvious is a central tenet of moral relativism. Unfortunately, it doesn't go much farther, so as to avoid being proven wrong in the future, maybe. Something that you don't define can't be wrong... but can't be right either. Therein lies the apathy of the theory.
Good and evil have changed through time, and will continue to change, but should that stop us from defining them? Mind you, I'm not debating that good and evil are arbitrary notions, entirely dependant upon the circumstances. What I dispute is the idea that because they are, they have no value and shouldn't be upheld to the best of one's ability. If we do not, it's chaos.
Those are moral dilemmas that have nothing to do with moral relativism, since they are internal conflicts within a given set of moral values, and they do not take other moral outlooks into consideration. Moral dilemmas predate by far the idea of moral relativism.
Sorry for for the rambling and possible incoherences, but too much coffee and too little sleep prevent me from doing being more concise.