Sorry for not reading past the first page, so maybe their conclusion is the same, but: in the case of the HIV test, it's pretty clear that people avoid it because the mere thought forces you to confront the possibility, and that is tough. At least that was my experience, even though I rationally knew that it was better to know, boy was it tempting to not pick up the result.

Another interesting tangent on it is that I got my results the same day, but there are places where they make you wait for a week, just so you think about it.