Obama drone strikes

Is it possible that inducing a psychological state of fear and paranoia is not just a side-effect, but indeed part of the tactical purpose behind deploying drones? What would be the longer term mental impact on us, if drones constantly circled overhead where we live, arbitrarily and randomly striking out people we knew, every now and then?
The five things you need to know on 24 May 2013... RIP LEE RIGBY RIP Drummer Lee Rigby, who was named yesterday evening as