What is living then, according to your statement, is the interpretation. How is that any different really? We all operate under the believe that our understanding of the document is all that really matters. If that is the case, then it makes no difference if the document is alive or dead, it is the meaning we take away that has any relvence. There are examples of the document that provide for our changing morals and ethics. "cruel and unusual punishment" seems worded to accomodate an evolving society - now is that prase dead? As we look at it I begin to lose the concept of dead vs alive.
"cruel and unsual" was instituted to prevent torture, spectacle punishment, justice as theater, and a myriad other things which were intensely popular particularly in french and spanish colonial zones.
the 1770's were not the 1970's, many "modern" nations at the time were indulging in all manner of depravity and barbarism to keep their kludges in check. shit, just google Junipero Serra, the franciscan butcher who was running california like his own personal Auto Da Fe. France was nearly as mad with their fomenting revolution and reprisals from the aristocracy.
pretending that the prohibition on torture and spectacle is in some way related to the militia and it's related acts of congress is pure sophistry.
google the militia act of 1792
http://www.westernjournalism.com/blogging-tools/historical-documents/antebellum-america-1789-1860/militia-act-of-1792/ which holds a view counter to your own, and favouring the well established right to bear arms as well as the right to arm bears.
this act was modified by the Dick Act in 1903 and the Dick Act is the basis for the draft and the presumption of an "organized militia" which would ordinarily be precluded by constitutional prohibitions on a standing army. our constitution is intended to be immutable (save by amendment) but the claim that it is "living" allows for extra-constitutional revisions at the whim of whoever has the reins of power at the moment.
the converse claim of a "dead" constitution is a self defeating argument that surrenders the presumption of life by claiming death. The constitution is neither dead nor alive, it is an ideal, turning it into a badmiton birdie for semantic gamesmanship demeans the constitution and the competitors in that shabby game of mutual masturbation
"The militia of these free commonwealths, entitled and accustomed to their arms, when compared with any possible army, must be tremendous and irresistible. Who are the militia? Are they not ourselves? Is it feared, then, that we shall turn our arms each man against his own bosom. Congress have no power to disarm the militia. Their swords, and every other terrible implement of the soldier, are the birth-right of an American ...the unlimited power of the sword is not in the hands of either the federal or state governments, but, where I trust in God it will ever remain, in the hands of the people.
The militia, who are in fact the effective part of the people at large, will render many troops quite unnecessary. They will form a powerful check upon the regular troops, and will generally be sufficient to over-awe them.Whereas civil rulers, not having their duty to the people duly before them, may attempt to tyrannize, and as military forces, which must be occasionally raised to defend our country, might pervert their power to the injury of their fellow citizens, the people are confirmed by the article in their right to keep and bear their private arms." ~Tench Coxe Pennsylvanian delegate to the continental congress