Why do you equate government and the honorable Joe Average? The government works at the pleasure of the Joe Average, so it's natural that the said Joe is interested to watch how his servants perform their duties - after all, he elected them to do that and pays them for that. At the same time Joe might be not interested for his lowly servants to keep tabs on him - that's none of their business, after all they don't compensate him for that information, so why shouldn't we have cameras to watch the police while completely denying them to use cameras to watch us?