Perhaps, but on the flip side, the widespread acceptance as dogma that all humans spread from Africa is probably rooted in no small amount of black-contempt as well. Why does it strike so many people as obviously true? Well, clearly this is only speculation on my part, but it's probably because blacks are perceived by so many as being so primitive.
It's got nothing to do with being obvious, any more than any of the other scientific theories are obvious. What is obvious is that earth is flat and that Apollo rides across the sky daily in his flying chariot, creating dawn, noon and dusk. It took many hundreds of years of calculations (and thousands of years of unproductive speculation and myth) before it became clear that the earth was not only round, it revolved around the sun. The Out of Africa theory is no more obvious than Newton's laws of physics. It took a lot of research into the fossil record in order to determine that this was in fact the case. As to primitivity, that's just silly. Blacks aren't any more primitive than whites, yellows or browns. If they were more primitive, we wouldn't be able to interbreed, any more than lions are able to breed with house cats.
First, the fossils. That information has since been confirmed by DNA studies.
Here is a good illustration of that data: Journey of Mankind.