Dude, it's not logical to claim a document is fraudulent and then immediately reference it to support your next point.
That Senior was not a citizen is not a good talking point, as nobody in the world has ever claimed he was. They merely claim that it is not relevant to Junior's status as NBC.
Until it is "legally" declared fraudulent (challenged and ruled upon in a court of law) then it is still a legal document.
Charges have to be brought and none have been to date, even on the lesser charge of uttering.
No charges filed, no ruling issued, no "legal" declaration of forgery...it's still "legal".
A kid goes to a bar and offers up his driver's license as proof of age.
The bouncer sees nothing wrong and let's him in.
The same thing happens for three more weeks and nobody questions him.
The next time the kid goes bar hopping he again shows his DL thinking that he'll get away with it just like he has in the past.
This time, though, the bouncer actually knows what to look for and tells the kid to wait a minute while he calls over the local LEO who happens to have "patrol duty" there that night.
The cop looks at it, sees that it's a fake and promptly busts the kid for using a fake ID.
Get the picture?
Until the ID is challenged and "an official" looks at it and declares it a fake the kid can use it all he wants as on its face it appears to be a "legal" DL.