Sometimes people hold a core belief that is very strong. When they are presented with evidence that works against that belief, the new evidence cannot be accepted. It would create a feeling that is extremely uncomfortable, called cognitive dissonance. And because it is so important to protect the core belief, they will rationalize, ignore and even deny anything that doesn't fit in with the core belief.

Forced to remain on the island French soldiers became "authentic racists. In particular he began socio-therapy which connected with his patients' cultural backgrounds. When he was not confined to his bed he delivered lectures to ALN (Armée de Libération Nationale) officers at Ghardimao on the Algero-Tunisian border.

His life and works have incited and inspired anti-colonial liberation movements for more than four decades. Fanon is known as a radical existential humanist thinker on the issue of decolonization and the psychopathology of colonization.