Science can often be complicated, which makes a simple explanation extremely appealing. Sometimes, these simple explanations are correct. Sometimes they are spectacularly wrong.
One of the most complicated areas of science is evolutionary biology. Describing the origin of current species is a lot like putting together an enormous puzzle when most of the pieces are missing. A simple explanation for an evolutionary problem would be very, very appealing. Some people believe they have found one for human evolution, and they call it the “Aquatic Ape Hypothesis”.