You think that because you think Jeff is making the case for a certain standard. He's not. He's just arguing the historical facts of what the standard is. It's like he's explaining why Germany invaded Russia, and you're demanding that he make the argument for why that was a good idea. It's not the same frame of reference.
No, he's not. He's cutting and pasting walls of text to bludgeon others with. That's not 'arguing' by any means.
He's arguing that the common understanding was that simple birth inside our borders was sufficient. He intentionally truncated quotes from Bingham in an attempt to hide the truth; That the common understanding was that the children of parents who owe allegiance to foreign sovereignty do not qualify.
He is further ignoring the obvious point. If this was Bingham's understanding, it was most definitely the understanding of the rest of congress, therefore it was the explicit intent of the 14th amendment, therefore the 14th amendment does not mean what Jeff W. Alleges.
But people with common sense already knew this. The founders weren't stupid, and neither was John Bingham.