Allow me to point out that bicyclists were the reason roads were paved in the first place.
Having said that, I KNOW there are lots of scofflaw bicyclists out there and I see them every day. I also KNOW that there are plenty of IGNORANT bicyclist riding stupidly because they never learned the rules of the road.
A couple of years ago I cycled to work at least twice a week during the summer, a distance each way about 25 miles. On my return one day I encountered a young girl riding the opposite way.
Now get this: she was on the wrong side of the road, she was riding in and out of the parked cars, her helmet was hanging on her handlebar, and she had her music machine plugged into her ears. She was about 12 years old. I estimated her life expectancy at about 30 days max. Sad.
I also know of deliberate attacks by motor vehicle drivers against cyclists and the gendarmerie couldn't care less. Considering that the cagers are surrounded by tons of metal and the cyclists are not, both sides should consider the possible consequences.