NEVER SATISFIED (THE RIGHT)
Because it isn't about facts and never is, it's about ideology. Those on the right who have recently backed off the whole "birther" thing—because they saw the writing on the wall and/or wanted to undermine Donald Trump who was eclipsing them and their usual distortions and misinformation and lies—still cling to other non-facts to bolster their extreme rightwing positions, like insisting that cutting taxes even further for the wealthiest among us will somehow "create jobs" when all the charts and graphs and historical records show that not to be true at the level they are at now.
The right is not interested in facts or even in best policies, they're interested in power—getting it and maintaining it and overthrowing those who have it who aren't them. Trump isn't a true rightwinger, he's just an opportunist jumping on the right's bandwagon because it'll get him the news coverage to increase the value of his "brand" and if he does decide to run for the Republican nomination it'll get him the rightwing majority base in the primaries where polls show most in that category still believe Obama is a Muslim born in a foreign country and no amount of proof saying otherwise will sway them from their need to ascribe some form of otherness to this smart black man who somehow became president of "their" country.
But it's a smart move on Obama's part to throw the long form birth certificate into the fray at this point, because it will weaken Trump's position with independents but not with the hardcore rightwing base of the Republican party therefore leveling the Republican-nomination playing field a little and keeping the competition divided and fighting among themselves.