You don't even need scheming or crusaders or General Rippers. You don't need much of a conspiracy at all to wind up with results that look very much like a conspiracy. I'm a big believer in never assuming malice when incompetence is an adequate explanation. Just a potential example jumping off SalmonGod bringing up Occupy:
An analyst at the NSA is, by all accounts, going to be a very intelligent person. They're keeping up with things, and Occupy events start coming across their radar. On some level, a very intelligent person is going to realize that a changing status quo is going to make their job harder. Now, I don't think anybody actually would think, "Geez, I don't want to work any harder, I'd better do what I can to shut these guys down." But, the point is, they're now aware of something that can make their life more difficult. They're going to keep tabs on it, so that they can adapt appropriately as things progress. They're going to keep an eye on leaders as they emerge, on whatever else they can, because it's stuff they Need To Know. They're in the business of worst-case scenario, so they're not going to treating it optimistically, either.
And this is going to be the case with a lot of analysts. When they notice problems, they're going to talk to coworkers and superiors about it. When they don't, it's not worth reporting on. Over a couple of weeks, the entire movement is going to get thought of in a pretty poor light, not because anybody intentionally sets out to sabotage it, but because that's just how its reputation is going to evolve in the office. And that feeds right back into how they focus their resources. And now, with the spotlight focused and the attitude of the organization turned against Occupy, any perceived transgression is going to get slapped down, whether it's really illegal or not. And that's pretty much where we're at right now.
No plots were set in motion to keep the rich in power. Nobody set out to abuse their authority. Nobody's set on an arbitrary crusade. But that doesn't mean everything's fine. There's more to good governance than motivations.
EDIT: tl;dr version
A lot of people independently acting in their own best interests, for reasons that are benign and sensible at the time, can create some shitty situations.