If 100% of humanity are intuitively appalled with an idea, but some of them go ahead and do it anyway, that's just insanity.
Really? I think almost everyone has things that are intuitively appalling, but they do anyway. Walking by a scruffy, hungry-looking beggar? Drinking alcohol? there's something that your intuition and your actions disagree on.
Personally, I'm not a utilitarian because I don't think ANYTHING is the Right Thing to Do - it's all preferences and private esthetics. But really, if you are a moral realist, you shouldn't claim that other human's moral intuitions are binding, you should Do The Right Thing regardless of any disagreement or reprisals. (note: you're still allowed to not know the Right Thing, but even then you should have some justification other than "feels icky" for whatever you do choose to do).
OK, I guess I was equivocating on intuition.
But on your second paragraph: I don't think I actually disagree with you about what actually exists.
Here are some things that I'm sure you'll agree exist (or at least can exist):
Now, the term "morality", and related terms like "right" or "wrong", ...
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