The Precautionary Principle can saves lives.
The world has become a lot more dangerous and uncertain. We have not seen a pandemic the likes of COVID-19 for a century. Within three short months over 250,000 people have been confirmed to have the virus, while hundreds of thousands more are infected and undiagnosed. Naturally people are looking to scientists to provide answers for how we can and should respond to this pandemic.
In the 19th and 20th centuries, standard economic models assumed that people would act in a rational and predictable manner. These models are flawed, of course, for if modern psychology has taught us anything it is that we are massively complex beings who are ultimately in important respects not predictable, often not rational, and certainly often rational in ways that are judged irrational by ‘experts’. We are moreover (and this is less widely understood) not predictable not only in practice but also in principle: i.e. this is not a limitation that can be overcome.