Apply Occam’s Razor.
Unless I see some pretty solid evidence for other reasons, I go with the logically obvious.
Obama is an indecisive coward. and a liar. He flat didn't have the balls to take a decision that risked civilian casualties. In this case the "civilians" were terrorists.
Not that it mattered. It didn't matter if they were Avon ladies on acid. The lives of *our* personnel were in danger and they should have been defended with all available resources. They weren't because sissy Obama doesn't have the stones.