The God-given right to self-defense is secured by the Heller Court's construction of the 2A. The 2A's predicate clause permits an alternate construction that would limit the Constitution's protection to the militia context, whatever the heck that means nowadays. That alternate construction may be just an election or two away. It is to prevent that from happening that I advocate codification of the individual right.
If it is a God-Given Right, (unalienable), then the Court did not grant it, and nothing the court does can take that Right away.
I explained at length the purpose and meaning of the RKBA, and continuing to spout the nonsense that the right exists so the government can form armies (to exert power) still does pass muster. Especially when, in the Federalist, the point was made that it was The People who retain the Right to protect their Liberty from Government force. The Amendment even says "The Right of The People...", a phrase which, in all other cases with the Constitution, reserves a Right specifically to The People, and none other.
The Court may fail to acknowledge that unalienable (God-Given) Right, as it has failed in the past to acknowledge the freedom from involuntary servitude of one group of people it failed to acknowledge as People, and failed to defend the innocent lives of another group it fails to recognize as People, but neither the Supreme Court, nor any court, can take the Right away.
It is unalienable, a natural and God-Given Right,
it exists. Period.
The Supreme Court can only fail or succeed in their purpose to secure that Right (and others) from the illicit machinations and usurpation of Government, (from what has traditionally been defined as tyranny). They have been wrong before.
Now we're back to the
raison d'etre for the 2nd Amendment--to secure the Rights of the People
from Government when Government fails to secure their Rights.