The only real answer that I can see is that they didnt want to anger the Libyan terrorists.
Pst. Don't tell Obama I told you but what he's really worried about is you figuring out what really happened in Libya. If you understood that this administration gave weapons to Muslim terrorists (including Al Qaeda) to overthrow Gadhafi, you might be shocked.
But what Obama is really worried about is that Americans are going to eventually figure out that those same weapons were used to kill Americans.
And it gets worse than that once you start thinking.....