>This is a pretty weak appeal to authority.

This is not appeal to authority. You keep misusing that term in this thread to belittle things you dislike. Appeal to authority would be to say an argument is right solely because an expert said so. No one has made that argument. The things people are pointing out to you are quotes and historical facts. There is no other evidence than these to demonstrate the point.

So much of what you say is wrong. A good source with a lot of historical references is the 1982 Congressional Research Office report on the matter, with hundreds of citations for you to check. Some quotes:

"To preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them." (Richard Henry Lee, Virginia delegate to the Continental Congress, initiator of the Declaration of Independence, and member of the first Senate, which passed the Bill of Rights.)

"The great object is that every man be armed . . . Everyone who is able may have a gun." (Patrick Henry, in the Virginia Convention on the ratification of the Constitution.)

Yet you claim "2A is absolutely not about individual rights. No Founder ever talked about it in this way."? I just gave you two Founder quotes; there are many more. There's a lot more in that report that proves you wrong. The state constitutions they wrote also prove you wrong.

The research report traces the right to bear arms from around 800AD through many places that formed the right as the founders understood, and provides ample quotes from Founding Fathers to show that they did intend individual rights. It's also why the vast majority of the states, when copying the bill of rights into their own constitutions, also give individual rights. As evidence, here are a few of the state constitution rights from the original 13 colonies. All states are covered in [2]:

Connecticut: Every citizen has a right to bear arms in defense of himself and the state

Delaware: A person has the right to keep and bear arms for the defense of self, family, home and State, and for hunting and recreational use

Georgia: The right of the people to keep and bear arms shall not be infringed, but the General Assembly shall have power to prescribe the manner in which arms may be borne

Massachusetts: The people have a right to keep and to bear arms for the common defence. And as, in time of peace, armies are dangerous to liberty, they ought not to be maintained without the consent of the legislature; and the military power shall always be held in an exact subordination to the civil authority, and be governed by it.

New Hampshire: All persons have the right to keep and bear arms in defense of themselves, their families, their property and the state.

Pennsylvania: The right of the citizens to bear arms in defence of themselves and the State shall not be questioned.

Rhode Island: The right of the people to keep and bear arms shall not be infringed.

So either all these states didn't understand the original intent, even though many of them had constitutions written by the same people, or the modern interpretation is wrong.

[1] https://www.constitution.org/2ll/2ndschol/87senrpt.pdf
[2] http://www2.law.ucla.edu/volokh/beararms/statecon.htm