It's not the distraction that bothers me, as said most things can be distracting it's the effect on you as a road user. Your distracted in a car, chances are your going to cause a problem for someone else, your distracted on a bike your going to be the one in trouble. Listening to the radio in my car in traffic is unlikely to increase my chances of dying ( accident maybe, dying no) listening to music on a bike in traffic is.