Science is one thing, and finding proof is easy, because experiments can be made that yield clear factual results.
Attitudes on race are often veiled and concealed. Many people say one thing because it is socially unacceptable to express what they actually feel.
Feelings are not always rational, experiments are therefore difficult, inconclusive or both, as there are too many variables. The social sciences are less subject to scientific study.
I think that Mythbusters has been cancelled. I do not have access to all of the programs on Netflix.
The concept of the program is a good one, but they did get too silly upon occasion.