You must be really confident to make a statement about 4 billions of people, 99% of which you have never interacted with. Your hyper microscopic sample is not e

You must be really confident to make a statement about 4 billions of people, 99% of which you have never interacted with. Your hyper microscopic sample is not even randomly distributed. This reminds me of those psychology studies in the 70s and 80s were the subjects were all middle class european-american and yet the researchers felt confident enough to generalise the results to all humans