Citi bike must be good?

For whatever reasons city bicycling is viewed as good. Environmental protection and healthy exercise are obvious reasons that I can understand and support. NYC has recently introduced the bike sharing initiative but I was a bit worried. The other night I was almost hit by a bicycle on the road in the street of NYC whiling following traffic light. I had similar experience in Berlin. The cyclists do not follow traffic rules. while western countries advocate this healthy cycling practice, they have to learn from Asian countries, good things can turn bad if we do not prepare for all possibilities. Cyclists have to remember that they have a vehicle that may pose danger to themselves and others. If cities have to change for better. New rules may have to follow to protect all parties. Rules should not be viewed as restrictions only. It sets predictable pattern that everyone feels protected. No one would want more accidents and simple rules can do the good.
P.s  air pollution is too serious in major cities. It is not as healthy as people think. With more exercise, you breathe in more carbon dioxide than oxygen. Would lung cancer incidence rate be increased?