Does the government keep secrets from us
I'm sure, but much is because the major populous would be afraid, and the people who search for the truth are thought of as odd, that is how the mass copes with the idea of not knowing. Search one random law a day, it is fun and it can't hurt any =]
Most likely, everyone has their own theories about what they hide from us and why.
All the time but it is for good reasons its mostly military plans, technology, and names of CIA and special agents
All the time.
Yes alot of secrets. The only time they do not is if your the president or if you work for them