No, they may not be safe, but that could be improved. The way people react to cyclists is often unsafe.Bikes should be banned. They aren't safe.
Maybe enforcing the Cycling Proficiency test would be good; a lot of cyclists don't seem to know the rules, and plenty of them disregard them. But the logistics involved would be mind boggling. You'd have to hire probably thousands of people to conduct the tests, and then this discriminates against the many safe cyclists on the road.Either that or give them numberplates, make them pass a test and charge them insurance.