That's because you're an average Joe.
And even you, you use a pseudonymous account name here on HN.
Now think of all the lives of change-makers, dissidents, activists etc that were fucked up with the use of such private information (from their sexual preferences to who they meet), under all kinds of regimes, in the US and abroad.
Try reading how some of the pioneers of civil rights for blacks were treated, for example, what kind of files were kept on them, how they were setup and pressured etc. It's not like MLK emerged from nowhere, said "I have a dream" and everybody cheered and that was that.
Heck, you don't even have to go that far. Even opinions expressed on HN can get people fired from their jobs if they go public. Even mild ones, including mere jokes said in private: a guy was fired for telling a "dongle" joke to his friend at a conference -- because someone eavesdropped.
Plus, your notion pressuposes that things will always be totally fine (save a "dystopian future"), and nothing will ever make citizens question the government, big corporations, etc. Which does not hold, really. From McCarthyism to the Civil Rights movement, down to the Vietnam War protests and recent stuff like Occupy Wall Street, there's always such discord, and there will be even more in a future with rising inequality and diminishing middle class.
Hundrends of millions (perhaps including you) might continue to be oblivious to all this (as they were oblivious about Vietnam War protests and/or rock n' roll in rural Idaho), but tens of millions were and will be affected.