Link and Link
Short summary: The NSA's activities don't just stand to compromise the privacy of ordinary citizens. They also stand to compromise the privacy, and thus the integrity, of government officials.
How many prominent government officials who have publicly opposed the administration have had personal scandals thrown into public view in the past few years and been forced out of office?
The problem is that this isn't a conspiracy theory - the problem exists regardless of whether or not the conspiracy exists. The integrity of every level of our government has just been thrown into question. As long as these programs exist, the integrity will remain in question.