What do you think its purpose is?
I don't think anything and what I think along with what anyone else thinks is irrelevant.
But I do assume a few Americans have read the Declaration of Independence. Not that they remember the words or anything important or consider why they were stated.
I'm willing to listen on what grounds should limitations be imposed?
If circumstances should at any time oblige the government to form an army of any magnitude that army can never be formidable to the liberties of the people while there is a large body of citizens, little, if at all, inferior to them in discipline and the use of arms, who stand ready to defend their own rights and those of their fellow-citizens. This appears to me the only substitute that can be devised for a standing army, and the best possible security against it, if it should exist.
-Hamilton
Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom of Europe. the supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed, and constitute a force superior to any bands of regular troops that can be, on any pretense, raised in the United States.
-Webster
This may be considered as the true palladium of liberty. . . . The right of self defence is the first law of nature: in most governments it has been the study of rulers to confine this right within the narrowest limits possible. Wherever standing armies are kept up, and the right of the people to keep and bear arms is, under any colour or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction.
-Tucker
"Whenever governments mean to invade the rights and liberties of the people, they always attempt to destroy the militia, in order to raise an army upon their ruins."
Rep. Elbridge Gerry of Massachusetts, spoken during floor debate over the Second Amendment, I Annals of Congress at 750, August 17, 1789.
"Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe. The supreme power in America cannot enforce unjust laws by the sword; because the whole of the people are armed, and constitute a force superior to any bands of regular troops that can be, on any pretense, raised in the United States."
Noah Webster, "An Examination into the leading Principles of the Federal Constitution." in Paul Ford, ed., Pamphlets on the Constitution of the United States , at 56 (New York, 1888).
"On every question of construction, let us carry ourselves back to the time when the Constitution was adopted, recollect the spirit manifested in the debates, and instead of trying what meaning may be squeezed out of the text, or invented against it, conform to the probable one in which it was passed."
Thomas Jefferson, letter to William Johnson, June 12, 1823, The Complete Jefferson, p. 322.