… the right of self-defense was not a right that was enacted by governments and granted to the people. The right was inherent in the natural order of the world, and the right existed everywhere. The principle of a natural right of self-defense was pervasive among the American Founders. The Founders viewed resistance to tyranny … simply as an application of the right of self-defense, which was a natural right regardless of whether a person was attacked by a lone criminal, or by a large criminal gang, in the form of a tyrannical government.
David B. Kopel, The Catholic Second Amendment
(Good essay — but riddled with typos.)