I agree that it's dangerous, but I love biking too much not to – usually just as a commuter. I always just assume every driver has either: 1) not seen me and is going to accidentally kill me, or 2) seen me and is going to intentionally try to kill me. Joking aside, if you learn how to assert yourself on the road, take a lane when you need to, and pay attention to what potentially threatening vehicles are up to, I think you can drastically reduce the chances that you are involved in a harmful accident. Always wear a helmet, use really bright lights at night, don't ride on sidewalks, and all that jazz, too.