I believe you're being slightly unfair to those institutions. As one example: the US Government, as a policy, never lies to the American press (and, by extensio

I believe you're being slightly unfair to those institutions. As one example: the US Government, as a policy, never lies to the American press (and, by extension, the people). They may sometimes do so to the foreign press, or they'll deny comment, or they'll give you an answer that doesn't actually answer your question. But there used to be a line they dared not to cross. There are many reasons for this. Some will insist it's the morally right thing to do. But a better explanation is usually that it's in no one's interest: Career bureaucrats are simply never in a position where lying is a good option unless they're trying to cover up a crime they committed. They're risking their job, and possibly criminal prosecution, without any real potential upside. For elected officials, the same is usually true–with the potential exception of a lame-duck President who has nowhere to go but retirement. But at that point, they've probably gotten used to managing their office without lies. Of course that's a description of the past, and the lower reaches of elected executive office (but not employees) have a worse track record, where many a town mayor with a coke habit has lied to cover his creative accounting. Nixon also comes to mind. But before you say "Iraqi WMDs", I'd say that was arguably a case of a government convincing themselves through wishful thinking. Maybe they're just really good at lying? It's the old problem: is the revelation of a scandal proof of spreading corruption, or does it show that the system is working, and the bad apples are caught? It really seems to come down to personal judgement. I can only say that having interacted with governments on multiple levels, and seen a lot of, for example, the vast amounts of data they produce and decisions they make that are never the subject of the news, I have come away with the impression that the Government is usually trustworthy, and that decisions are often made with a surprising lack of emotions. For example, I once won a lawsuit against a local government. Yet a few months later, we won a tender that we deserved to win, even though the decision was made by the very same people we had previously fought in court. If all else fails: even if government were corrupt to its core, saying so would be less effective than acting as if it weren't, and focussing on specific incidents. Because faced with a public that believes only the worst of every politician removes all incentives for them not to become exactly that sort of thoroughly corrupt politician. And if it's part of society's lore that all powerful people lie, that becomes a self-fulfilling prophecy when people new to government just follow the clues they got from popular culture.