First of all I'm not totally sure if this fits better here or in the forum for political debate and what not, but it seems to me this is a philosophical point and better off here. By the end of the post it's probably not an ethics thing, but I'll just leave it up to the mods and admins from here. Anyway...
The history may seem unnecessary, but I feel it's better to see exactly where I'm coming from and how the logic flows from the start.
Democracy can be traced all the way back to ancient Greece and Rome, however, for my purposes, it is only necessary to focus on it's development from about the year 1200 A.D. to the present. Why this year? Well, this is when the Magna Carta (Great Charter) was first proposed. This wasn't the first document to limit the power of the King by law but it fulfills the role of a poster boy quite well and I won't bother to attempt changing that.
So, with this charter people established that the government (in this case Kings and Emperors) are not free to do as they wish. Kings often claimed Divine Right, or that they are appointed by God and therefore free to do whatever they see right. The Magna Carta limited this, and eventually, nearly 600 years after this, people in general decided that the King doesn't even have Divine Right. 'We' realized that royalty rules simply by right of inheritance and the flexing of powerful autocracies and military muscle.
With the establishment of constitutions in France, the USA and England, to name the big ones, we established that the government derives its right from the people. Government has none of its own, only what the people (who do have rights) give up to it in order to live as safely or freely as they desire.
So the real question about government is not whether it is allowed to do something, as it isn't inherently 'allowed to do anything,' but rather, how much freedom are we willing to give up in order to be 'safe?' (as well as what exactly makes us safer, policy-wise)
Finally, I'd push for discussion on this question, as well as how this ties into classical ideological views about he left and right, neo-conservatism vs. classical conservatism, as well as libertarians vs. democrats.