A poisoned root bears poisoned fruit. All of these people no doubt got their legal advice from that same poisoned root. It is no surprise that they are wrong en masse.
Most legal minds just follow popular fallacy, and very few ever bother to research this issue for themselves. Those that do tend to want to follow the same non-sequitur ruts as the Wong Kim Ark ruling, which had an even smaller majority than the "Separate but equal" Plessy v Ferguson decision by that same court.
They do a lot of mental gymnastics to get around obvious flaws in their understanding, but then they aren't really trying to understand, instead they are merely justifying whatever it is they have already decided to believe.
Now you’re just being silly and arguing just for the sake of argument.