Comment by lo_zamoyski

How can you determine whether it makes accurate predictions? This isn't always as trivial as you make it seem. Even the data's trustworthiness requires proxy measures like provenance and criticism of figures one takes as trustworthy. And even then you have to be able to evaluate the data to determine whether it predictive, which itself requires skills and domain knowledge.

The idea that we can live without authority is nonsense. We can't. So, when dealing with subjects where we are out of our depth, we must learn ways to discern who is likely to be more trustworthy, and this often requires using proxies. Institutions exist to help makes this possible, even if they are not infallible, and they alone do not suffice: basic reasoning and tradition also factor in.