What you've done there is change my argument to a different one to fit your agenda - the agenda of showing my argument is invalid at any cost.
What was the thesis that my argument was addressing? Was it the thesis that 'some' moral values are 'some' of my values?
Nope.
What is the thesis that moral values and 'some' of my valuings - my values - are synonymous?
Nope, although I did address that one too for I have said time and time again that the same argument can be run for any subset, just as it can be run for your values as well as it can be for mine.
It was the thesis that moral values are my valuings. That is, that being morally valuable involves nothing more than being valued by me.
That thesis.
Again: I stress that the same argument can then be run for any subset of my valuings, and the same argument can be run for your values (and any subset of them). And again for any groups valuings. And it was precisely by going through this process that I ended up at the conclusion that therefore moral valuings are valuings of just one subject. I mean, how else did I get to that conclusion!?!
But again, the thesis being considered in the argument we're focussing on right now, is whether ALL moral values are synonymous with being valued by me. Not 'some' valuing activity of mine, but just 'being valued by me'.
Now, the word 'valuings' is ugly, I know, and some pointed this out, but I used it on purpose - to convey that what we are considering is whether the valuings constitutive of moral valuings are synonymous with my valuings - that is, my valuing activity.
So, are moral values - moral valuings - identical with my valuings? To express it a different way: is 'being morally valuable' synonymous with 'being valued by me"?
Well, if being morally valuable and being valued by me are synonymous, then if I value something, necessarily it will be morally valuable.
That's true. Obviously true. Do I really need to explain why? If "being morally valuable" is one and the same as "being valued by me" then if I value something, it is "being valued by me", which - by hypothesis, is what "being morally valuable" is being supposed to consist in. I don't know how to make that clearer. The thesis is that 'being morally valuable" and "being valued by me" are synonymous. The same. Identical. One and the same. Samey samey sameingtons. The same. And if they are, then it follows - obviously follows - that if I value something, it will inevitably be morally valuable because 'being morally valuable' just is to be being valued by me. Nothing more, nothing less.
Put some symbols in there if you want, and use terms like 'modal' too if you like - but just realize, as any competent English speaker surely would (if, that is, they were not fanatically obsessed with my argument turning out to be invalid) that what I am saying is that if moral values and my values are one and the same, then if I value something it must be morally valuable, because 'what it is' to be morally valuable just is to be being valued by me. I mean, that's the thesis under consideration (a thesis I reject, of course, before someone decides I endorse it).
So is that clear? Is premise 1 now clear?
Premise 1 says "If P, then Q"
P says "if moral values (all of them, not some of them) are my values (so, if being morally valuable is one and the same as being valued by me).
Q says "if I value something, necessarily it is morally valuable"
It is true. Not false. True.
Now what about premise 2?
Well, what is 'not Q'? If Q is "If I value something, necessarily it is morally valuable" then what is the opposite of that?
This: "If I value something, it is NOT necessarily morally valuable". And that's what premise 2 says.
Premise 2: If I value something, it is NOT necessarily morally valuable"
It follows from those that "being morally valuable" is not the same as just being valued by me.
That is, the thesis that for something to be morally valuable it is sufficient that I be valuing it, has been demonstrated to be false.
Now what about a subset of my values? What about things I am valuing on Tuesday, or things I value and value valuing? Well I said - umpteen times in fact - that the same argument can be run for any subset of your valuings that you care to identify. Any subset. Any at all. Could moral valuings be identified with what you value when you're wearing green? Nope - same argument will be valid and sound for those. Could moral valuings be identified with what you value on Tuesdays alone. Nope - same argument will be valid and sound for those too. Just run them. But you don't need to, do you - it is obvious that it is going to work just as well for any subset.
And what goes for my valuings - all of them and any subset - will go for yours. The same argument with your valuings or some subset of them - will be valid and sound.
How else did I arrive at the conclusion that moral values are the values of a single subject - someone who is not me, not you, not anyone other than herself - apart from by this winnowing process? Put in any of your values - any of them - and the same basic argument will demonstrate that moral values are not identical with them.
All you have done is change my first premise and then show me how arguments with different first premises are invalid. What was the point in that?