Recently there has been a lot of debate about governments passing bills giving them the right to spy on all kinds of personal communications, be it mobile, email ..etc. Needless to say there's an uproar everywhere this is happening. For me, I don't mind the government spying on me.
If I look back, at some point it was common for people to take their own security into their hands (by carrying a sword, pistol or a rifle). Then we basically gave up this right and we delegated it to the Police. Same thing with trusting the judicial system to decide whether you're guilty or not.
I guess my point being, if we assume Big Brother (all hail the Orwellian world we live in) is good then nothing bad can come from the courts, police or the spy agencies listening in to your conversations. However, if Big Brother is corrupt then honestly I'd worry more about the Police busting me for no reason, throwing me in jail for a life-time and continuously torturing me BEFORE I'd worry about a spy agency listening to my calls to my mother.