All well and good, but that's not what we're talking about here, is it? Basically, you're saying that, in your opinion, the federal government shall not infringe on an individual's RKBA. Fine.
That says nothing about the states and what the states are allowed to do.
"We don't need incorporation for the 2nd to apply to the states."
Of course we do. Just as we need incorporation for the 3rd Amendment, the grand jury indictment clause of the 5th Amendment, and the 7th Amendment for those, too, to apply to the states.
The Bill of Rights was understood, at its ratification, to be a bar on the actions of the federal government. Not the states. The states had their own constitutions.
Which had to comply with the Bill of Rights where individual amendments did not specifiy otherwise. So the 1st did not apply - but 2 through 8 did, because they did not have the "Congress shall pass no law" qualifier.