Interestingly, when most people simply choose to do what most people choose to do, you get an emergent 'herd mentality' which can lead to some very strange places. It is also sensitive to very small purturbations - which in real terms means, the one person who does manage to think for themselves may find they have an outsized effect on the direction of the crowd.

I think this mentality is also where the term 'sheeple' comes from.