What Ethical Standard Do Most Nihilists Subscribe To?

Some people might find the meta-ethical theory of moral nihilism shocking (here it is, in a nutshell, in case you don't know: http://en.wikipedia.org/wiki/Ethical_nihilism). But of course meta-ethical theories are neither good or bad. They are just scientific theories. Saying one of them is heartless, is just like saying it is heartless to say the Sun will run out of fuel and die in a hundred billion years. No, that is simply a fact. It is neither intrinsically good, nor bad.

Anyways, I still find the theory of ethical nihilism hard to believe, if for no other reason that there are situation in human life that call for answers. For example, let's say, there is a little girl stuck in an abandoned well. Do we save her, or leave her there? According to nihilists, it doesn't matter. So what then do we do? You can see what I am talking about.

Anyways, my question (to get back on track) is simple: What ethical standards do most moral nihilists subscribe to? I know Wikipedia also says most nihilists do not think we should just live without any ethics. So what system of normative ethics do they subscribe to? And very importantly: Why?

BTW, I don't subscribe to any one meta-ethical theory, because I am not a scientist. I am a Liberal and a Humanist. And I do tend to think that there is one ethical theory that is better than the rest. Especially, one based on mercy, forbearance, kindness, love, etc. So maybe I would be a naturalist. Or maybe a non-naturalist (cf. http://en.wikipedia.org/wiki/Ethical_non-naturalism). I just don't know.

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