Interesting. As soon as I figured out the emboldened text referred to the section above it, rather than below, as is the norm in dissertation.......
As for a philosophical asswhoopin’, I needn’t bother, for the entire section on Moral Existentialism, particularly the subsections beginning with “The true moral condition of the global virtual social group” and ending with “Morality, viewed (correctly imo) in this bottom-up way, cannot have top-down rules because that is not what morality really is“ is predated by....oh....couple minutes or so, exemplified in The Fundamental Principles of the Metaphysics of Morals, 1788, specifically with respect to the idealistic notion of “the kingdom of ends”. Not exactly, of course, but generally, Kant has said pretty much what you said within those subsections.
But you have an intrinsic contradiction in your version, to wit.....
the only unaltered fundamental rule we have is: do not be a hypocrite. — Kenosha Kid
.......which is correctly delineated as a rule, with the exculpatory.....
“The moral rule is contingent.”
However, in the next...
“do what you will that harms no other (...), to never step in to help others or resist others who harm, (...) and never expect others (....)”
....are very far from contingent rules, for they abide no possible exception. Which, I must say, leaves the metaphysical barn door wide open to the notion of moral law in the form of deontological moral philosophy.
But I totally agree: morality cannot have top-down rules, these being nothing more serious than, and having just as little power as, a mere administrative code.
And I don’t give a solitary hoot for the science, the chemicals in my brain that make me both charming and obnoxious, cheerful and gloomy, lend a hand to those I like and leave a dipshit in the ditch right where I found him. I am quite known to myself without knowing a clue about my oxytocin level, thank you very much.
Still, pretty much like all the other expositions on a topic, here we have a lot of what’s and who’s, but not much in the way of how’s, and while natural morality may tend to eliminate the need for a priori knowledge, the existential morality, which asks.....
“how do I choose when to do good/oppose harm”
.....would certainly seem to require it, for therein lays the how of the necessarily subjective determination of choice with respect to moral action, and the innate subjectivity of good itself. Or, at least the how we can grasp with words, rather than it be forced upon us by some obtuse empirical architecture.
Kudos, nonetheless. Well done indeed.
Peace.