We have insurance for a lot of adverse events. Think about it for a moment. You are insured against an auto accident, catastrophic injury or illness, root canal, fire in your home, somebody coming to your door and getting bitten by your dog, hail, your death, and floods. Your jewelry is insured, if you're Troy Palamalu, your hair is insured and your visitor-biting dog? Even he's covered in case he has to go to the vet. (For related reading, also take a look at Get Through Divorce With Your Finances Intact.)
Here's the interesting part: many of these events are much less likely to occur than some of the events that we've never thought to buy insurance against - for example, how about divorce?