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For example, what "constitutional principles" are you talking about? What is "original intent," and why is it important, and why should we adhere to it in a world that in many respects is immeasurably different from the one in which the Founders wrote the Constitution?
I only want to address this one point - the world may look superficially different, but I argue that on a basic level, it's pretty much the same as it has been since humans came onto the scene. Adam and Eve are as relevant today as they were when the story was first told.
I have heard the argument, for instance, that the First Amendment is not particularly applicable today because when the FFs wrote it they couldn't have envisioned a world where most of us carry around little computers called cell phones, and the internet, and emails and whatevers. The basic rights to freedom of religion and speech are still applicable, regardless of the medium used.
Some leftists claim that the Second Amendment is no longer valid because it was written at a time that muskets were the cutting edge of weaponry and that an AK could hardly be considered to fall within the limitations of the Second.
I don't understand your argument. In what fundamental ways has society changed to the point that the Constitution is no longer valid?