I am going to play devil's advocate a bit, but these are thoughts that cross my mind when I hear sentiment similar to what you express. Just wondering what your take is in response.
I worked in the Intel Community (IC) and while there are a few bad bananas of the Snowden type, as well as those who abuse their position of trust to monitor exes, etc., by and large the agencies are full of law-abiding, hard-working stiffs who use the "would I want this done to me?" test every day. There are hordes of lawyers looking for illegal activities and they find and have them dealt with the way most of us would want.
I don't think the issue is with those the honest law-abiding employees, but with the bad bananas. Lawyers looking for illegal activities? That's a start, but it seems like lawyers are to advice what is legal and what isn't rather than track down illegal activity. I would hope that it would be impossible to arbitrarily access people's information without some sort of warrant. Why is the system such that employees can monitor their exes in the first place? How is Snowden a bad banana? Isn't it your duty to speak up if you're being asked to do something you think is not morally justified.
The problem with massive conspiracies is that they have to be kept absolutely secret by everyone involved and that's just against human nature. People screw up the most mundane things all of the time, and yet they're supposed to be able to somehow turn off the mistake/bravado/arrogance/lie/etc., facets of their personalities from 9 to 5 every day of every week, month in and month out, year after year, blah, blah, blah. Who are these superhumans and how do we make more of them who can be flawless in their every move and action?
There are lots of government operations that were kept secret. The Manhattan project being one example. Then there are all the ones if found out about way after it was no longer important, like MK-UTLRA. It seems naive not to assume that there are operations going on right now that most people would find abhorrent. But yes, these things to leak, you only have to look as far as Snowden, Manning and Vanunu to see that (and how these people are treated afterwards).
WikiLeaks was supposed to reveal to the world that governments, especially the supposedly all-powerful U.S. Government, were massively evil and out to control every aspect of our lives. Instead, it just put a lot of confidential informants at risk of death and much worse, while showing that the known $#!t birds (KSBs in the professional IC parlance) were at least as bad as expected and occasionally worse. It also demonstrated that our officials basically got things right and tried to do their jobs properly, with some occasional doozies of screwups. It was the Saudis who wanted us to take out Iran, other countries' ambassadors who bad-mouthed Sarcozy and Berlusconi, etc.
I don't think that's what wikileaks was supposed to reveal, but gunning down journalists and children from apache helicopters is not an example of people doing their jobs properly.
Spying on other countries is what intelligence agencies do, both ours and theirs. There are over 50 stars on the wall in the public entrance to the CIA, and most have no names or stories associated with them there, but they do inside the secure areas. They're a constant reminder that there really have been Napoleons, Hitlers, Stalins, Kim Il Sungs, Mao Zedongs, Pol Pots, Idi Amins, Milosevics, and legions of others too numerous to count.
The issue is that we're spying on our allies (who are in turn spying on us) and our citizens, not that we're spying on regimes that are a potential threat.
If you want to take on a conspiracy, I would focus on the unelected business people who run the credit rating agencies, investment rating agencies, banks, retailers, advertisers, lawyers, and hundreds of thousands of others who do real and permanent damage to millions of peoples' lives every day through mistakes, incompetence, maneuvers, manipulations, and lies that are nearly impossible to fight successfully. Where are the perps who nearly destroyed the financial systems through their arrogance and betrayal, for which the five year statute of limitations is about to expire?
Where is the outrage over the obscene amounts of money that are spent on political media campaigns that are essentially just garbage pits full of refuse? Those are our public airwaves, not theirs, and they have no more right to claim freedom to do what they please with them than any of us do. U.S. Senators are virtually all millionaires, the few who aren't are well on their way, and the usual path to Senator is through the House of Representatives. Representatives of whom, you may ask? Certainly not me or anyone I know, that's for certain, but I hang out with a fairly well-informed crowd, especially those who gather around the warm glow of the screen here and similar forums.
Because there are other issues that affect the world, does not mean that these are any less important.