I'm against "driving licences" for cyclists; however, I find it difficult to defend this position at times when I see how some people riding bikes do totally boneheaded things. Just the other day, I was sitting in-line at a left-turn only lane waiting for the light (on my bike). As the light turned green everyone started moving and this other cyclists was crossing the intersection (opposite direction) and then attempting to cross the street where the cars had a green light. So there he was in between us that were turning left and those that had the right of way. I wanted to stop and see how he managed that, but I was in the line of fast moving traffic.
I'm not against more stringent standards for drivers in understanding cycling laws, but we also have to look at ourselves. This is where I usually get blasted for being anti-cyclist