In our large, anonymous society, it’s easy to forget moral and reputational pressures and concentrate on legal pressure and security systems. This is a mistake; even though our informal social pressures fade into the background, they’re still responsible for most of the cooperation in society.
Bruce Schneier, expert in security systems
Could you link the source of the quote?
It’s in chapter 16 of Liars and Outliers, which AFAIK has no url.
Found it with google