The reason for the drone use in places like pak,yemen, and some other hell holes is because we do not have soldiers on the ground in these countries who can go after these targets. That, coupled with the fact that said countries are unwilling or unable to handle the problem themselves is the only reason for the drone attacks.
THERE WOULD NEVER BE A DRONE STRIKE ON US TERRITORY! Drones are only used as a substitute when the target can not be captured, which is always preferred as you can collect intelligence. Drone strikes leave little to no intelligence.

Civilian casualties are greatly exaggerated and are far less than there would be with a ground war.