There are likely as many false positive as anything else as a result of that same brain training and evolution. I'm warning against it is all.

One of our ancestors saw Oog get bit by red snake that killed him. Our ancestors avoided all red snakes as a result. But not all red snakes are poisonous. Regardless of the false positive, they were still safer avoiding all red snakes than those those that didn't recognize "red snake = bad".

Not to mention, direct causality is very rare in large social systems, which you note.