The alternative to drones is counterinsurgency. For example, the wedding party in Yemen, if it were a target of actual importance, would have been captured and interrogated, with suspected insurgents detained for further questioning. The problem is that we don't have the manpower or the political latitude to do that in all these regions, so we send in killer robots instead and hope we hit the right people. This is a recipe for high false positive rates, even with the best equipment, because the HUMINT and SIGINT that underlies target identification is shaky to say the least.