I agree with that. The RKBA does not depend on the 2nd amendment, and does not come from the second amendment. Its function was essentially a promise that the federal government would not create federal laws that infringed the right to keep and bear arms.
The people need to be armed, in order to maintain a boot on the neck of the government - that was (past tense intentional) the radical design of the United States government. The people in charge of the government, not the other way around. Those days are history.
Actually the “people” are more in charge today and that is the problem. In 1787 the electorate was restricted to certain white men.
Now socialist ideology is rampant because of the expansion of voters to women and minorities previously not allowed to vote. When 50% of the taxable pay NO federal income tax it will not be stopped or significantly rolled back.