Other reasons could include that the long form has a different father name, or he thinks that providing the BC could lead to requests for other docs like school records.
If he's a natural-born American bastard, it is unlikely to hurt him politically.
If he's a natural-born American bastard, and his school records reveal that his grades were poor, maybe it might hurt him a little bit.
I think he's either (a) a natural-born American citizen and a complete fraud, and thus UNQUALIFIED for the office of the President, or (b) a non-natural-born American citizen and thus INELIGIBLE for the office of the President.
I wonder why Rahm Emmanuel made that trip to Kenya last year?
I wonder why the island of Oahu experienced a complete blackout for about 12 hours, last Christmas?