We keep smoking when we know it is unhealthy, we keep drinking and driving, we vote on politicians based on one liners and the amount of media attention they get, we believe that the evolution theory is 'just a theory', we get in huge debt because of loans we cannot pay and we keep posting things on Facebook despite knowing better.

We are stupid in the sense that we do very stupid things even though we, in many cases (should), know better. It is the task of 'us' (people who know about internet privacy) to protect other people around us from being stupid with Facebook just as I would like to be protected by others in the things I am stupid at.