Why do people who have cats also seem to be more likely to have depression? Is it because cats are more likely to bite a depressed person? Or is it because of some sort of toxic parasite?
Perhaps because depressed people like cats. Or cats and dogs. Or maybe, really, there’s no link there at all.
But don’t worry… We researchers will describe data and make suppositions that don’t take into account the most obvious of explanation of them all.