Precisely! One reason is the obvious: That there is something potentially damning to hide.
The only other reason would be to tie up our resources and time fighting to see the documents.
My feeling about the latter, is that I still have time to write the Kamerads in DeeCee and tell them I really really would rather they voted against the latest Socialist crap. That does not take long, and at best only seems to change the point spread, not the game. Still, that leaves enough time to go for the jackpot--proving him ineligible and his actions from day one void.
And that could be a perfectly valid reason.
It could also be that the birth situation is totally legit, but there's something else that might disqualify him from the Presidency - like having been adopted and lost US citizenship, or having renounced US citizenship, or whatever. And he could let the birth certificate issue stew before finally producing the long-form certificate in order to squash the whole questioning dynamic and lastingly deflect attention away from whatever other issue there might be.
I don't know. I honestly try not to think about it that much. It makes my head hurt.
In any event, even if he's ineligible, dislodging him from the Presidency would appear unlikely, and if accomplished could turn out to be counterproductive. IMO.
I mean, do you really want Joe Biden as President of the United States?