"They may be called black because they're dark," What other reason was any group on earth designated as black besides skin color? It's not like theres some other intrinsic characteristic.
You don't ever see a blonde fair blue eyed swede being called black.
The albino reference is kind of inaccurate. Aborigines as a whole, other than their current location, fit nicely with several African populations. Melanesians, from Papua New Guinea got the name of their country due to their resemblance to specific continental Africans. Africa is a CONTINENT of mostly bronwn-ish people with varying features; the fact that many aborigines and Melanesians look like many Africans is not surprising. "If they're considered Black due to dark skin, then all people with really darks skin can be called "black" - and that also means that any light skinned black aren't black, if such a literal interpretation of the term is used." The reason light skinned " black" people were/are still called "black," was/is their affinity with other designated, "black," dark people, almost always through descent.