Bicycling is dangerous. There is no way around it. It is far more dangerous in the United States than some other places in the world. Following all applicable laws will certainly reduce your chances of being injured/killed, but it is not the only thing that can help save your life. Constant vigilance will help, also.
The ideas and suggestions in this safety section are just that. There is no guarantee these items will keep you safe. I follow them when riding but also realize that things happen no matter how active I am about riding safely.