> Some stripes on the road don't make cycling safe.
  > Cyclists that think carefully and act predictably do

I don't have any data to back this up, but it's my feeling that there are more drivers on the road that just don't pay enough attention to the road than there are reckless cyclists. At the very least, when there are cycle lanes there is a 'barrier' where if a driver crosses it they are unquestionably in the wrong.

  > require licensing for bicycle-only drivers

I would argue that there is less of a need to cyclists to get licensed. Recklessly driving a car is far more dangerous than recklessly driving a bicycle.