The "in the home only" thing is a ridiculous distortion of Heller.
The argument is: because the Heller case was about one gun in the home only, that's all the second amendment can ever be about.
It's such a ridiculous argument that it really should come with a "so neener, neener, neener" at the end.
The Heller majority said that the "core lawful purpose" of the second amendment was self-defense and that the need for this was most acute within the home. How can something be most acute in one place and not exist anywhere else?
The minority clearly did not anticipate this silly argument. Stevens said this in dissent, "Given the presumption that most citizens are law abiding, and the reality that the need to defend oneself may suddenly arise in a host of locations
outside the home, I fear that the District’s policy choice may well be just the first of an unknown number of dominoes to be knocked off the table."
Why would he say such a thing if he thought they had just restricted 2A rights to the home?
There is other historical evidence. No one likes to talk much about the Dred Scott case because of the ugly racism but there is more to it. Specifically, Chief Justice Taney said that one problem with treating black people as citizens would be:
"It would give to persons of the negro race, who were recognized as citizens in any one State of the Union, the right to enter every other State whenever they pleased, singly or in companies, without pass or passport, and without obstruction, to sojourn there as long as they pleased, to go where they pleased at every hour of the day or night without molestation, unless they committed some violation of law for which a white man would be punished; and it would give them the full liberty of speech in public and in private upon all subjects upon which its own citizens might speak; to hold public meetings upon political affairs,
and to keep and carry arms wherever they went."
Wherever they went. Not "in their homes" because the idea of an indoor militia is absurd.
As if more were needed, in 1895 the Supreme Court said that a man could defend himself
"while on his premises, outside of his dwelling house" in
Beard v US.
I hope the "in the home only" nonsense ends soon but I think the Supreme Court will have to directly settle it, as they unanimously settled the equally ludicrous argument that the second amendment could only apply to weapons technology in existence in 1789 (Caetano).