As an individual becomes a negationist.

Denialism is a deviation from the mental logic system. It is fundamentally the systematic application of sentimentality, about what you want.
Basically when a person is informed, for example, that a food is unhealthy, but that individual wants to eat, then he looks for possible positions to justify what he wants, even if it lacks logic.
The willingness to accept the flat earth, for example, seeks to be based on ancient information, which is the cosmological view of the Babylonian and Egyptian peoples, from more than 4000 years ago, and seeks to ignore the years of scientific research and knowledge tested and proven in laboratory.
Both examples clearly show the deviation of the mental logical system, to the foundation of personal will, over logic.

NegationismeducationNaturalism