I'm sure that my reading the God Delusion, by Richard Dawkins will confirm this, but it is already my opinion that we humans want to believe that there is some mystical purpose behind the things we encounter. I think it is a survival instinct against the harsh and mind blowing reality that the world is a totally chaotic place where stuff does and does not happen in a totally unrelentingly arbitrary manner. There is nothing which is meant to be any more than there is something that is not meant to be. Sure there are laws of cause and effect, but they operate at a level that is too complicated to analyse or indeed make sense of. To say that something is serenedipidy is to retrospectively assign it a status that makes it comprehensible. It's a romantic notion and I both like it and see it as a fallacy.
I suppose I have this vision of standing around the fireplace with some grand children and saying something like 'if I hadn't stubbed my toe that day, your grandmother would never have looked at me twice, and you'd all not even have been born.' Silly isn't it. Still it explains a lot.