As scary as it sounds, I think it is a goal for the government of any country to kind of keep the general populace a little naive. I think the less the people are aware, the more the people in power can implement their beliefs and political views in the system.
No, the government is not trying to keep the people of a country dumb by any means. they do have some secrets that it would not be safe to tell, but they try to fill in the public on all of the things that the can and that they should.
Some people in government do try to keep people dumb. Other people in government do not, because they know that it is a lot easier to fix the country by having a knowledgeable populace. The only people that like a dumb populace are the people that get rich off of people's ignorance.
When you put government in the hands of the people, government will inevitably attempt to control the will of the people. Keeping the people "dumb", or otherwise in the dark, makes them too unpredictable. Ignorance is only the first step in controlling the public. A man is more predictable, and therefore less dangerous, if he is sure about something wrong than if he is unsure about something right. The goal of modern governments is not to uninform, but to misinform.
While it may be in the best interest of the Government for it's citizens to not pay that much attention I don't believe it's the goal of any Government to actively keep it's citizens dumb, I think most citizens care very little about politics or many other political topics in general they are only concerned about what effects their day to day life.