Here's the thing, though: the purpose of a gun registry is not to make collecting guns once their possession is made illegal somewhat easier. There's no disputing that there are plenty of people out there -- Republicans included -- who would like to ban the purchase and/or resale of specific types of weaponry, and a smaller number who would like to confiscate weapons that are already out in the wild. But while registration would indeed make it easier to do this, I don't know a single person who advocates gun registration who does so
because it would make the confiscation of existing legally-possessed firearms any easier.
I actually find the parallel between this and the whole Voter ID thing to be a bit interesting, because it's certainly and inarguably the case that many Republicans have openly admitted that the entire point of Voter ID is to suppress poor and minority votes,
not illegal votes. But here we're pretending to worry that the purpose of gun registration would be to make the government aware of which guns to seize.
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Why is it so difficult to understand the Founder's demand that the citizenry must be armed with the same weapons or war as the military...
Leaving aside the (false) claim about the Founder's intent, let's discuss for a minute how the intent of the Founders is absolutely irrelevant to modern society.