I have the feeling that you are taking this somewhat personal, don't. I just wanted to say that it's an illusion that you are protected/safe just because everyone(including you) are being spied on. I'm 100% positive that if you give a lot of power to some group/people then it's just a matter of "when" not "if" it will be missused. I would not feel safe if my government recorded everything I did. Seems like being guilty till proven otherwise.
I don't think this is something that should be argued or debated upon. I just can't wrap my head around the idea that someone accepts being spied on and if someone came up to me on the street and tried to explain that spying is something I have agreed on then I'd tell him to take his deep thinking&spying and shove them up his you know what.
About the "greater good":
Once I got to the end of your post and found "greater good" there I kinda flipped that someone would see spying as a positive thing and automaticly went to the very extremes I guess.
I like my rights and fook the government!