The issue is that Supreme Court interpretations can, and have been, changed over time.
The Second Amendment says nothing about carrying arms. The Supreme Court has ruled that individuals "right to keep and bear arms" is protected. They've said a few things about what they think the "right to keep and bear arms" is, but really what they've said is not something that will stand up to strong scrutiny.
In Heller they said: "(f) None of the Court's precedents forecloses the Court's interpretation. Neither
United States v. Cruikshank, 92 U.S. 542 (1876), nor
Presser v. Illinois, 116 U.S. 252 (1886), refutes the individual-rights interpretation."
This is basically upholding Presser, which said: "
We think it clear that the sections under consideration, which only forbid bodies of men to associate together as military organizations, or to drill or parade with arms in cities [116 U.S. 252, 265] and towns unless authorized by law, do not infringe the right of the people to keep and bear arms."
So, the individual view of the Second Amendment, that an individual can "bear arms", still means that an individual cannot meet other men and "associate together as a military organization, or to drill or parade with arms in cities". It's simply not protected.
Now, if there is a clear cut "you can carry arms because the Second Amendment says so", it's not in Heller.
Heller also said "(1) The Second Amendment protects an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home."
"such as self-defense
within the home"
They also said: "It is not a right to keep and carry any weapon whatsoever in any manner whatsoever and for whatever purpose:"
And: "For example, concealed weapons prohibitions have been upheld under the Amendment or state analogues. The Court's opinion should not be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons and the mentally ill, or laws forbidding the carrying of firearms in sensitive places such as schools and government buildings, or laws imposing conditions and qualifications on the commercial sale of arms. Miller's holding that the sorts of weapons protected are those "in common use at the time" finds support in the historical tradition of prohibiting the carrying of dangerous and unusual weapons."
This does NOT come across, to me, as the Supreme Court saying that there is a right to carry in the Second Amendment.
You quoted one thing. I didn't take the time to find that quote, but the part that says "this is what the Supreme Court holds" talks about a right to self defense IN THE HOME (more than once), not outside of the home.