Problem with using the number of sources for confirmation is that the sources may not be independent. Eg the games they played with the Steele dossier, or the same "anonymous individual" leaking to 4 different media outlets.
Best way to test is to formulate a specific hypothesis and try to prove that hypothesis wrong. It can be ego destroying, but if you can manage to try to prove yourself wrong, it helps a little with confirmation bias.
Problem with using the number of sources for confirmation is that the sources may not be independent. Eg the games they played with the Steele dossier, or the same "anonymous individual" leaking to 4 different media outlets.
Best way to test is to formulate a specific hypothesis and try to prove that hypothesis wrong. It can be ego destroying, but if you can manage to try to prove yourself wrong, it helps a little with confirmation bias.