This article discussed one of the solutions proposed by psychologists to relieve drone pilots of the stress and guilt that comes with launching an attack: http://io9.com/psychologists-propose-horrifying-solution-to-...
I still wonder how much less existential strife an operator might experience by delegating the killing to an AI machine, especially if one can still see the faces (better resolution) and the carnage following "Siri" carrying out orders.