Droning doesn't kill only terrorists. There's plenty of collateral deaths (what do you think the ratio is, 1:10 intended targets to unintended when explosives are involved in civilian settings?) not to mention the labeling of who is and isn't a terrorist is hardly infallible. Of course those giving the go ahead are so far removed from the consequences that it must become easier and easier to order drone strikes when intelligence tells you it will "save American lives".