Or the American government can stop being cowards and throwing stones from afar. You can't go around blowing shit up without any solid intel. Oh look there's a convoy of cars, better blow it up is not a tactic; it's murder and a war-crime. What business do America even have in Yemen? They're not at war with them.
What I bolded in your quote is my point. The CIA would never have approved a strike like this and because of the way they've been treated by the Pentagon, why should they help them? The Pentagon wants to prove that they are tactically capable without the help of anyone else. The death of 15 innocent people is terrible enough, but it's even worse when not even one militant was present in the convoy. They could manufacture some kind of pathetic excuse or justification then.
The other thing is, I believe that the Pentagon thinks that they can blame all of this on the CIA since they officially haven't accepted responsibility for the drone program. What a bunch of amateurs. Chuck Hagel was never the right man for the job as Pentagon chief, you didn't see Panetta pulling this shit.