Many postes talk of bikes being careless. And yes, it does happen. But many drivers are irrational about bikes. I'm commuting, probably 12-15 MPH, traffic passing me at 40, no issue. Light turns red, cars stop. Now I'm passing them at 15, and you would think I was slapping their face as I go by.
If a cyclist is not obeying the law/rules of the road, and gets hit, that is on him. But if he is just riding along, obeying the rules with regard to lights and reflectors, and you run into him, it is you that is wrong