Things don't always happen why we think they happen

A supposed chain is, in reality, often a web instead, but the notion of being impelled down a path is very strong in us and it's much more difficult for us to think about multiple causation. Most of the things that happen in the world have multiple causes, of course, so we make a lot of errors of attribution.
                                                                 
                                                                                             - William Calvin, A Brief History of the Mind