Cyclists who do not act defensively are just plain ignorant if they think they are not going to get hurt in traffic. Obviously, there are cases where drivers hit cyclists and are at fault, but cyclists should generally stay out of the way. Also, cycling is usually a choice made for exercise or to save resources. Tim Woodhouse, Louisville Bicycles are a legitimate form of transportation. That is why bikes are allowed by law to be on the road.
Bikes are much more energy efficient and environmentally friendly than cars.
Cycling is also one of the most popular forms of recreation in the world, particularly in Boulder and much of Colorado. This is the same for cars. However, it has been my experience that a significant number of riders do not think they need to obey laws. I have seen so many go through a red light, with or without oncoming traffic, that it stands out when one does obey the light and the law. Same with driving on the Diagonal.