All you can do is ride safely and defensively, especially if you live in an urban area. There is a risk to everything as has been pointed out, but if you base your activities based on statistics then you would never drive a car again since you're at risk of having an accident more than you are of being hit by a car on a bike. I was hit recently and fortunately it was the bike that took the worst of it, but that hasn't stopped me from riding.