I'd love to see fewer cars and more bicycles. That said, at least in the US and in SF in particular, I've encountered way more blatant violations off traffic laws by bicyclists. There were so many times I had to jump back from an intersection where I had a green light as a pedestrian because a bicyclist decided to race through at full speed. They probably thought it was safe, but I certainly felled endangered.
In the defense of bicyclists, I think a lot of this happens because the laws and roads aren't properly taking bicyclists into account. Stuff like bicycle lanes at the end of the block also becoming turn lanes for cars should just be unacceptable and provokes conflict between drivers and bicyclists.
We're all primed to see conflicts more frequently when we use a mode more frequently. A lot of folks who don't bike only really encounter cyclists when they're pedestrians walking around, and so feel this fear then. In the US cyclists break rules at roughly a similar [1] rate to drivers according to an FDOT study. FWIW cyclists interact with drivers much more frequently which is why so many cyclists feel animosity toward drivers.
In the defense of bicyclists, I think a lot of this happens because the laws and roads aren't properly taking bicyclists into account. Stuff like bicycle lanes at the end of the block also becoming turn lanes for cars should just be unacceptable and provokes conflict between drivers and bicyclists.