The current darker population was imported from parts closer to the equator when there simply weren't enough laborers locally.
And the mostly British-descended Australians built Australia into a thriving, exemplary first world nation, in spite of all the dangers inherent in that continental country.
Inaccurate. There were no Bantus at the Cape when the Dutch arrived, but there were plenty in the central and northern parts of what is now South Africa.
AFAIK, white South Africans never imported black slaves. They did import Malays, Indians and a few Chinese, but they had all the blacks they needed and more.