Why does Breitbart say they believe Obama was born in Hawaii?
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Because he was still intimidated by the MSM. The whole “Birther” propaganda campaign has been a huge success. Even the great Breitbart was afraid of the label.
"Afraid" is the wrong word. As you said, the MSM successfully brandished those who disbelieve Obama's US birth as insane nutcases in the eyes of the general population. Embracing it in spite of this perception relegates yourself to irrelevancy, when Breitbart's mission was to run counter to the MSM.
It's the same reason Rush and Levin don't embrace the story. It's not some grand conspiracy, despite what some FReepers seem to think.