The reason bad cyclists pose a risk to the rest of us is this.
The way you behave tells people how you see yourself, and thereby how you expect to be treated.
Every time a cyclist jumps a red light or rides on a pavement, that cyclist is implicitly buying into the idea that bikes are closer to toys than grown up transport. In deciding the rules of the road don't apply to them, bad cyclists reinforce the view that cyclists are not legitimate users of the roads.
The reason bad cyclists pose a risk to the rest of us is this.
The way you behave tells people how you see yourself, and thereby how you expect to be treated.
Every time a cyclist jumps a red light or rides on a pavement, that cyclist is implicitly buying into the idea that bikes are closer to toys than grown up transport. In deciding the rules of the road don't apply to them, bad cyclists reinforce the view that cyclists are not legitimate users of the roads.