And thus, it explains nothing. Any theory that can explain anything is useless to science, because it becomes unfalsifiable. This is what evolution is becoming. So many people take it for granted and start to assume evolution for everything. They no longer see it as a limited, scientific explanation for certain observed phenomena, but instead as something that obviously happened, so everything that has happened obviously happened because of evolution. This leads to just so stories like this one. I think the opening sentence says it all.
Different groups of people evolved to be less alike — except when they became more similar.