In a conventional military situation, drones could take out tanks, artillery, or troop concentrations, or even enemy generals. However, drones on US soil should be for surveylance only. Only positive ID of a criminal etc, can be face to face. They should have a right to be able to surrender to authorities. Americans are supposed to have a right to trial, and are presumed innocent until proven guilty. Killing someone from the air while they are walking down a street doesn't give them a chance to surrender or fight.