You’re mixing belief with Trump’s actual positions, which are nationalist in character. Whether or not Trump believes white supremacism is correct is irrelevant to the fact that his positions are those of a white supremacist. Nationalism is often opposed to the outer, for example Algerians slaughtered any Europeans they saw on sight during the Algerian revolution. It is nevertheless true that this violent national liberation was a progressive movement against colonialism, and was created by colonialism.

As for Fanon, his masterwork (and the one most relevant to our discussion) is The Wretched of the Earth.