Why are motorcycles and mopeds never part of the discussion? Better fuel economy versus a car. No need to revamp basic infrastructure because they keep up with

Why are motorcycles and mopeds never part of the discussion? Better fuel economy versus a car. No need to revamp basic infrastructure because they keep up with traffic. And, at least for motorcycles, a requirement to carry insurance and generally accept personal responsibility for one's safety instead of demanding bogeymen cagers change three generations of urban habits. For example: killed on a bicycle implies stupid car; killed on a motorcycle implies idiot motorcyclist. I see no difference.