I wondered about that. As a Jew, King would have been among the first to lose her head to those who Bergdahl was assisting. Although the left, including way too many Jews, still seems supportive of jahadis so long as they’re anti-American.
Carole King and other may have been doing it for the right reasons- they may noy have known the full story.
I don’t know if it was Bergdahl’s personal politics that were a big issue to her, but I think any entertainer would step back at a moment like this and wait to see how the cards play before becoming more entangled in the controversy/scandal.
Originally she was just going to play at a concert to raise awareness. Then it became one to celebrate his release. His release isn’t quite what was originally hyped.