It is not just that the nationalistic plans of these people are morally reprehensible. A White ethnostate in the 21st century would fail. And it would fail spectacularly.
Saying Biafra deserves to be independent, or even saying the opposite, is a bit like saying that the world deserves to keep spinning: How do you even begin to justify why?
Belgium currently exists as a microcosm of the multicultural cooperative effort that is modern Europe. Like the broader EU, it faces the same rising tides of nationalism and populism. Will Belgium survive?