I think I'm ready to sum up. The issue is how to interpret the 2nd amendment, which is:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
I argued that it should be interpreted straightforwardly, in the standard manner for English sentences using a nominative absolute phrase:
A well regulated Militia is necessary to the security of a free State and the right of the people to keep and bear Arms shall not be infringed.
Basically there are two ideas conjoined, the first idea expressing a motivation for the second. This, I argue, was Madison's intent. This is the 2nd taken at face value, the Occams Razor simplest interpretation, taking what Madison wrote to be exactly what he meant.
Sav argues that it should be interpreted in a non-standard manner, with the first phrase a necessary condition for the second phrase:
Only if a well regulated Militia is necessary to the security of a free State, then the right of the people to keep and bear Arms shall not be infringed.
In this interpretation, if a militia is not necessary, then there is no right to bear arms. Sav's argument for this interpretation is ... well, he never really gives a reason, just the bald statement "I think the first clause is explanatory indeed, which renders it "restrictive" in this context."
First, he tried (and failed) to create a sentence where the nominative absolute phrase was a necessary condition. I pointed out that, even if he concocted such a phrase, that wouldn't prove that the 2nd Amendment was similarly exceptional.
Then he argued that "the Founders were not grammarians", so we should not interpret the 2nd A with standard English usage. First of all, this does not follow; secondly, even if it did follow, that wouldn't prove that the 2nd should be interpreted in his particular non-standard manner.
Then Sav argues that, because the other Bill of Rights amendments were worded more precisely, the 2nd A should be interpreted in his particular non-standard manner. Again, that does not follow.
At this point I made what was in retrospect a mistake: I offered speculation on why Madison worded the 2nd A so imprecisely. I hypothesized that Madison may have added the strong militia statement to the rights statement to "sweeten the pot" politically, i.e. he hoped that with both the RTBA people and the strong militia people on board, the 2nd had a better chance of passing. I think this is a plausible explanation. It was a mistake, because it allowed Sav to divert the discussion from the meaning of the 2nd amendment to a critique of my speculation about the reason for Madison's imprecise wording. All this is a red herring - irrelevant.
Back on issue, Sav argued that "it's unreasonable to think that the Second Amendment follows" standard English convention regarding nominative absolutes, because of "the lack of these phrases among the remainder of the Bill of Rights." Again, this doesn't follow, and even if it did it does not support his
necessary condition interpretation. The convention in question is:
nominative absolute phrases are explanatory, not qualificatory.
The rest of the debate was reruns:
Sav takes an earlier version of the 2nd A Madison wrote, with the same nominative absolute, and makes another unsupported claim "it is abundantly clear" that it is a necessary condition for the right to bear arms.
Sav repeats his non sequitur that, since other amendments are worded better, his necessary condition interpretation must be right.
When all is said and done, the interpretation of the 2nd amendment seems to hinge on the nature of nominative absolute phrases in English. Virtually all English professors, English teachers, and internet sources (google "nominative absolute") say that such a phrase is explanatory and not qualificatory (a necessary condition) with respect to the main phrase. If a non-standard meaning is claimed for such a phrase, the burden of proof that a non-standard meaning applies is on the claimant. Sav has not provided proof that a non-standard meaning was intended by Madison, nor that the 2nd should be interpreted in his particular non-standard manner.