Patient Zero

Recently it was discovered that, due to a clerical error, AIDS researchers originally got it wrong when they labeled Gaëtan Dugas as patient zero in the spread of HIV across North America. It turns out that he was one of many at the time. So we decided to examine the ethics surrounding the idea of the search for a patient zero of any kind. Why is it that we always feel the need to find an origin of the things that happen to us?