This is not uncovered ground though. Philosophy and logic cover the notion of truth and reality in some depth. The entire field of law is based on proof beyond

This is not uncovered ground though. Philosophy and logic cover the notion of truth and reality in some depth. The entire field of law is based on proof beyond reasonable doubt. The aim of fact-checking isn't to be a perfect system that covers every single possibility and edge case. The aim is to reduce the effectiveness of lies and propaganda, so that people are less misinformed when they go about their daily actions and democratic duty.