@oralloy,
I'd have to say that I agree with none of your arguments, which don't properly address why the sentence starts with 'a well regulated militia'.
As for it starting a militia movement (presumably well regulated) - why would I care? My comments here were aimed at people who were interpreting English based on an agenda, who: ignored the first part of the sentence; and/or couldn't explain the purpose of first part of a sentence; and/or couldn't explain the relationship between the first and last parts of the sentence; but wanted to focus solely on the end of a sentence; then claimed they were unarguably correct.
As I mentioned it is a sentence of progression, being : subject, reason, outcome. And all of it is related (as everything within a sentence is, unless a contradiction is introduced by words like 'but'). So the outcome does not exist outside of the subject, and the subject, arguably, not outside of the reason.