There are two contexts in which the phrase 'good book' can be used: The first is when you mean to say "In my opinion that was a good book" and the second is when you mean to say "This is objectively a good book."
Ok, I think I understand what you're saying, but there's a nuance that I don't understand. As I see it, you're implying that both of the above statements can be valid. However, if it were possible for books to be objectively good, how could anyone form an acceptable subjective
opinion about a book's quality? Isn't that like saying "In my opinion, A = A"?
Just because you're invoking a shared criteria, doesn't mean it's objective. Two Twilight fans arguing about which book of the series is best could have the exact same criteria for a good book, and thus can use that to gauge which book is best
relative to their criteria. The fact that people can have different criteria is exactly what makes the quality of books subjective. You can't have multiple objective criteria.
To put it bluntly, moral rules are the abstract 'business-end' of pack rules.
I wouldn't necessarily disagree with that. But are those pack rules not subjective? Did the pack not see homosexality as immoral not too long ago? Are there not multiple "packs" with varying moral norms?
Even if you were to argue that some moral codes has been universal, such as murder being considered immoral by civilization throughout all history, it still proves nothing. The fact that the rule is derived with this analogous
pack rule logic means it's nothing more than
argumentum ad populum to say that it's moral on those grounds. Because a rule is necessary in order to survive in the pack doesn't mean it's moral nor immoral.
Further, the is-ought dichotomy is so easily solved with an IF, it is barely worth talking about.
Speaking of pathetic... at that point your argument is not even addressing morality.
IF you want to be a serial killer, you
OUGHT to use a sniper rifle in a small city. That's merely an inference to achieve goal-oriented behavior.
IF you want to be fit and you are human then you OUGHT to eat a nutritionally balanced diet and exercise regularly.
That in no way addresses the issue of whether or not being fit is moral or immoral.
Wanting to be a rapist says nothing about the morality of rape.
Replacing the
IS with an arbitrary conditional whim (like "wanting to be happy") shows that you don't understand the is-ought dichotomy at all. "Being human" is the IS, then you would have to show why that implies that you OUGHT to be happy. Goal-oriented behavior and desires can be anything: moral, immoral, or amoral. Respective examples: wanting to feed the hungry, wanting to rape a woman, wanting brown hair.