It's true we are making less collateral damage then in the golden days, but the problem is that the more advanced one side becomes the less of a chance the other side has.
It's not just about fighting terrorists. We don't know who will be in command next. Giving this tech into the wrong hands will do some massive damages. There is always a chance to find ourselves on the wrong end of the drone.
Also the drone targets a single house, bombs it to oblivion and then someone says they are 80% sure, they bombed the right house with the right people in them. Not to mention a lot of times the people killed are civilians who were actually supportive, but because they are dead now, we just make the rest angry and make them side with the enemy.
We are a long way away making sure we are killing the right target.