You are correct that I disagree with your opening argument on absolute Truth. However, my opinion in this instance is entirely irrelevant. What matters in this particular case is your opinion.
If you are interested in my opinion I shared it in a recent debate on the nature and consequences of nihilism.
https://bitcointalk.org/index.php?topic=1373864.msg15883731#msg15883731Also there you will find counter arguments from the perspective of nihilism which are more in line with your starting posit that there is no absolute Truth.
In that thread I mentioned one metaphysical fact, which is an absolute:
"the world in which we live is not the only one in which we shall live or have lived"
it is one which has been recognized by
eminent researchers throughout the ages. A great link for anyone who is curious about intellectuals who profess religious belief.
Here is another absolute, this time it is an ethical fact:
11. YOU MUST NOT IMPOSE NOR FORCE YOUR FREE-WILL UPON THE FREE-WILL OF ANOTHER. ALSO KNOWN AS "THE LAW OF NON-INTERFERENCE".
I think that this law #11 professes absolute moral correctness, so it is obviously by definition a
moral system, in my opinion.
Any group which thinks it has the absolute moral correctness, is already by definition an immoral system IMO.
Believing in moral absolutes like law #11 is not immoral per se; if such belief were immoral, then knowing a moral fact and believing in it would be immoral--by definition.
Like I mentioned in that thread, to solve the valuation problem, a wide diversity of moral lessons and instructions must be comprehended and evaluated because of the lack of a priori truths; that is to say that each one is on his/her own spiritual journey. Lessons can even come from non-physical teachers (e.g. extraterrestrials) and I am lucky enough to have found useful teachings (from beyond Earth) that I will share here: I opine that the contents of Phoenix Journal #27 are impressive and obviously the result of INTERVENTION; this Journal lays out the laws of GOD and Creation in full detail.
Why will you not consider the messages that are offered for your protection and wisdom? THE LAWS OF GOD ARE FIXED...IMMUTABLE...MAN MAY CHANGE WHAT HE WILL BUT HE WILL NOT CHANGE THE LAWS OF GOD FOR THEY ARE THAT WHICH WAS GIVEN FOR BALANCE WITHIN THE CREATION.
I also mentioned this about values:
"In another context, man may find himself giving up those values that were (somehow) discerned ex-nihilo and instead return his free will to GOD and live by faith according to the rules given unto mankind for the total transformation of the species (true progress)."
The Operator-Owner Manual is a source for those rules; I have always sought out new and diverse teachings and I wish to share the benefits of this strategy by pointing out these valuable writings. I do agree that the right values will take a genius very far in life.
Many geniuses are still being born into the world, but they are not being given the recognition needed for survival for the point of the corruption is to destroy that which is already present as values and prevent the new of beauty and perfection to flourish.