Why the threat of being blacklisted?

Anyone can blacklist anything. Blacklisting something is not a law or ruling, just an agreement amoung a group to not deal with a person or group. If enough people agree not to work with or go to movies with the persons in this film, then their blacklisted. Easy as that.

Do you understand how racist and ethnocentric that response is?

"The white man is long gone from governing Africa but killing, mass genocide and widespread corruption remain the norm. Where does that leave your theories??"

Just because the age of colonialism is over doesn't mean Africa isn't living in its consequences. If I go some place, kidnap a bunch of people, kill a bunch of people, force my way of life upon them, and leave, there is going to be a lasting impact. Things aren’t going to return to normal, why do you think that Europeans leaving Africa would have fixed everything they destroyed? Britain, France, Portugal, Belgium, Germany, and Italy might not currently be in control of Africa, but you still see the boundaries that they created up. For example, look at the Tutsi and Hutu- before the Belgians came in, the stratification between the two groups were flexible and conflicts between them weren't very severe; they were socioeconomic castes and not ethnicities. The Belgians played favoritism and broke them much further apart and turned them into distinct ethnicities via craniology, hair thicknesses, etc. - a bunch of pseudoscience BS. The early 1970s and 1994 genocides are results of that. In the Congo post-independence, the Belgians were largely responsible for Patrice Lumumba's murder (they have admitted to this) and the C.I.A. knew of the Belgian's plan and their role in his murder is unknown. Big business across the 'industrialized' world has continuously exploited African countries, post-independence. Just as European structures and institutions remain in Africa (you alluded to these), negative impacts remain.

"The white Europeans civilized Africa, built cities, gave them medicines, education, sanitation, farming, technologies they would never have dreamed of in a million years and Christianity via the missionairies."

It is ethnocentric to believe that everyone wants to live as white europeans. Sure, I may enjoy those technologies, but it is fairly clear that many Africans would have much preferred if Europeans never entered Africa. Besides, many technologies have created huge negative impacts. As far as education is concerned, there were Universities in Africa long before there were white men in the Americas. And what the hell does ‘civilized’ mean? Does being white make you civilized in your view? Do you have to use ‘western’ technology to be civilized? You have to be a Christian?

"Nobody knows what went on inside the African interior pre colonization because there was never a written record."

You think that just because there wasn't white people recording records in Africa, they don't have a history?! Get real! Even in white written history, there are records taken (although completely skewed by white adventurers) of chiefdoms, kingdoms, and states that have had little contact with Europe. There were many white guys (I’m guessing you ignore the writings of everyone who isn’t white) that traveled into Africa before colonialisation. Livingstone? Also looking at Ethiopia, there have been written records there for ages, long before Europeans even touched the land - look at the Fethra Negast and Kebra Negast.

Yes there was slavery in Africa prior to the Portuguese, but if you knew anything about African slavery you would know that the system of slavery was completely different and on a MUCH smaller level. People weren't relocated to different continents when there was internal slavery. It wasn't until the era of 'legitimate commerce' in the mid-late 19th century where slavery in Africa held similarities to slavery in the Americas and Europe (at least when slavery was still around in those areas).

"Most American slaves came out of the Congo/Angola and were sold by warring tribal chiefs to the white traders." So that justifies slavery for you? You do know that slaves went to other places than the Americas, right? Looking at the eastern coast of Southern Africa (where Kwazulu-Natal is, if you didn't know), there were trading ports at numerous places, but especially Delagoa Bay and Port Durban/Natal - if you look at the records, you'll find that slaver trading was very common here. Julian Cobbing and many others have done some remarkable research. If I were you, I'd look into some of Cobbing's articles in The Journal of African History.

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South Africa started reforming in the 1970s She was always freer better governed and more democratic than most countries- especially in Africa. Apartheid was wrong but singling out South Africa was unjustified.