...being necessary to the security of a free State...
The logic flows from the Preamble.
Note that it is the People's liberty that is being secured. Also note that the only places where "secure" and "security" are mentioned are the Preamble, the 2nd amendment, and the 4th amendment protection of being secure in one's person, houses, papers, and effects.
We the People of the United States, in Order to... secure the Blessings of Liberty to ourselves and our Posterity...
The 9th and 10th amendments reiterated the point, and the 2nd amendment backs it up with the method of enforcement.
Note that the 1st amendment contains the desired approach "to petition the government for a redress of grievances."
Today, the government has found a way to deny anyone who wishes to petition for redress. It's called "standing," and apparently, nobody has it anymore. And being secure in one's person, houses, papers, and effects, has also recently fallen by the wayside.
If this keeps up, the only method left to the People to maintain "the security of a free state" for "Ourselves and our Posterity" will be the 2nd amendment way.
-PJ
I already pointed that out in first post. Winner goes to the most murderous.