Let me now fully review the argument you presented in this post.
Premise (A) is understandable but, as it seems to me, it is unnecessary. You should remove it.
Premise (B) is also understandable. It appears to be necessary because (D) is referencing it but I would say this one is unnecessary too and thus in need of being removed.
Premise (C) isn’t quite clear, so it should be rephrased. I already suggested splitting it into two different statements. I suggest splitting it into (C1) which states “The highest goal of every being is to have all that they want” and (C2) which states “In order for a being to attain their highest goal, they must make sure that noone’s consent is violated”. Since (C1) also looks completely unnecessary, you can ditch it too, leaving you only with (C2).
Premise (D) is too complex. It is made out of three different statements. I think these should be independent, so splitting (D) into three independent statements would be the right thing to do. Some of them aren’t exactly clear. For example, the purpose of the first statement, which is “Since we’re not there yet, the highest current morality is harm reduction”, is not exactly clear and it appears to be redundant. So I’d suggest removing it. The second statement, which is “People concetrate better when they’re not being continuously cut again on a raw wound”, is understandable and I’d say absolutely necessary. But it should be a premise instead of being a conclusion. The same goes for the third statement, which is “We need all the people we can get to solve this problem once and for all, and we need them in tip-top shape mentally”. It is necessary but it should be a premise rather than a conclusion.
With all of the above in mind, I would rewrite your argument in the following way.
First, I would present argument (A):
[tab]A1) In order for a man to attain their highest goal, he must make sure that noone violates another man’s consent.
A2) A man should always choose to do that which brings him closer to attaining his highest goal.
A3) Therefore, a man should make sure that noone violates another man’s consent.[/tab]
Then, I would present argument (B) which argues in favor of statement (A1). Like so:
[tab]B1) In order for a man to attain his highest goal, he needs the help of everyone else.
B2) A man cannot help another man attain their highest goal if someone is violating his consent.
B3) Therefore, in order for a man to attain his highest goal, he must make sure that noone violates another man’s consent.[/tab]
That’s super simple and straight to the point.
If it proves to be necessary, you can then go on and provide arguments in favor of (B1) and/or (B2).
There is still one more check to do. I have to check that the final conclusion, which is (A3), is equivalent to what you set out to prove. And what you set out to prove is that “Morality is objective”. So the question is: what exactly does Ecmandu mean by “Morality is objective”? You aren’t of help here, so I have to make a guess. My first guess was that it stands for “For every moral statement (S), its truth value is independent from what anyone thinks its truth value is”. But it turned out to be inccorect. My current guess is that it stands for “There exists a universal moral statement that is true regardless of what anyone thinks”. “Universal moral statement” means “A moral statement that states that everyone should (or should not) make certain decision under certain circumstances”. An example would be “No human being should kill another human being under any circumstances”. “True regardless of what anyone thinks” means “Other people’s opinions do not determine its truth value”.
That said, is “You should make sure that noone violates other people’s consent” equivalent to “There exists a universal moral statement that is true regardless of what anyone thinks”? Not exactly. But it might be an instance of “Universal moral statement that is true regardless of what anyone thinks” in which case it would be pretty straightforward to derive the conclusion we’re supposed to reach.
So is (A3) a moral statement? Is it a universal one? Does the argument conclude that it’s true? And does it conclude that it’s true regardless of what anyone thinks?
(A3) is obviously a moral statement. And it’s obviously a universal one (it says “A man should do” which translates to “Every man should do”.) Argument (B) obivously concludes that it is true but it what it does not is conclude that it is true regardless of what anyone thinks. That’s why you need the argument that I presented earlier.
You need this:
[tab]Let “statement of fact” denote any statement that says that some aspect of the world is such and such.
Argument:
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Every statement of fact is either true or false regardless of what anyone thinks its truth value is.
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Every moral statement is a statement of fact.
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Therefore, any given moral statement is either true or false regardless of what anyone thinks its truth value is.[/tab]
And since (A3) is a moral statement and every moral statement is either true or false regardless of what anyone thinks, it follows that (A3) is true regardless of what anyone thinks.
And that’s it.
As for your actual argument in the debate thread, that one is more complex, and in a way, it is worse. I might review that one some other time.