I used to cosplay as a bike messenger in Seattle. I did not follow the rules at all on my ride to work. There were few bike lanes, and a lot of morons rode on the sidewalks.
I have only been to Paris once, but the cyclists were much more sane in my experience. The bike lanes were clear, and for the most part they stopped at a red light.
I would wager it's the usage of payments and ignoring of pedestrian lights by cyclists is a big factor.
As a pedestrian, I've had FAR more encounters with aggressive cyclists than aggressive drivers (also anecdotal). Makes walking downtown more stressful.
looks at the reason
CARS.