IMHO, the right to bear arms was important to the founders because they wanted people to have the means to overthrow the government. They realized that all governments eventually fail including the one they just formed.
All other reasons, defense against crime, etc.. came later. It would be interesting to see which weapons they would want to allow ownership of in today's world. I suspect they would be against registration and would not want to make it easy for the corrupt government to identify and confiscate weapons from those who bear arms.
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