This is a public lecture by investigative journalist/activist Jeremy Scahill:

https://www.commonwealthclub.org/node/65484

Very chilling account of the impact of drone warfare on the targeted population as well as the democratic values of USA.

From another perspective, here is an interview of General Norton Schwartz:

http://www.uctv.tv/shows/The-Air-Force-in-the-Twenty-First-Century-with-General-Norton-Schwartz-Conversations-with-History-25072

Harry put the drone warfare question to him near the end of interview.