There is a reason for that. The locals use the US as their weapon of revenge. So if one family has an ongoing argument with another family and one of them is throwing a wedding, the other family reports it as an Al Quaida meeting.
Often these family conflicts have lasted for years already and likely more people died in the past (not by drones)
So it was a successful hit, you know, just not for the party that shot off the actual hardware.