Confirmation Bias

Confirmation Bias is a type of internal fallacy in which a person only searches for or accepts information that aligns with their already formed opinions and biases.

Instead of looking for competing sources, confirmation bias means to read similar sources in a one-sided way.

A person who believes the Earth is flat may be a victim of confirmation bias. As they believe any sources who say the Earth is round are lying, they will only look for other Flat-Earth believers for evidence of the shape of the Earth.