I would answer your question with a question: Monitored by whom and what for? When it comes to tracking people, where they go, what they do and say, there is always the potential for the abuse of their natural, human rights. If history hasn't taught us this, then nothing will! However, there is also the potential for good to come from tracking and monitoring people under certain circumstances. For example, if we were to have a serious outbreak of a deadly disease in our country, wouldn't we want to know who has it, where they're at and what we can do to prevent the spread of an outbreak to the rest of the population?
It always alarms me when people say, "Well, I've got nothing to hide, so why should I care?" That depends on what type of government your country has and who's in charge in the government at the time, doesn't it? If someone in power wants to force you to do something you don't want to do, you might very well have something to hide! Besides, just how far are you willing to let any government pry into your life? The saying, "give them an inch and they'll take a mile" fits particularly well, in my opinion, when it comes to letting government gain power over your life. This is why many in America, like our founding fathers, are in support of limited government.