Nope, thats why the Founders put in a mechanism to amend it, should society feel the need. Pretty smart guys, understanding there would be things they couldn't begin to imagine and making sure that future generations had a way to shape the document. So, not being a religious person, I might agree with you that God didnt imbue his creations with certain inalienable rights. Which has no bearing on whether Man recognizes that we are all better off if we act as if that all humans have them.
Logically, the case can be made that the fact that those weapons exist has been a strong reason that we have not. Want a list of countries that either fell into anarchy, or became distatorships or fell victim to dictatorships since 1776? Some appear on the list mulitple times
And quiter a few are now free nations due to the fact that America was there and not one of the above? That seems like a logical argument to me. Or do you mean that no other nation has fallen vto these conditions since the last time this nation put a stop to that crap?
Methinks you want to craft the case in the terms most favorable to your argument. I think that history is long and it's never unwise to think the last 40-50 years is the only place to look for answers.