OK, the statement "guns don't kill people, people kill people" is in no way equivalent to "people don't kill people, cars kill people" (which is a paraphrased version of what you posted). Your argument has absolutely no logic to it whatsoever.
Also, since you posted that the 2nd Amendment was only written to apply to the weapons of time, does that mean that Freedom of Speech and Press also only apply to technology of the time? Shouldn't it only apply to quills, parchment, and hand printing presses? After all, the framers of the Constitution could not have anticipated the internet, smart phones or cable TV. Right?
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