Yeah, if they factored the externalities of burning fossil fuels into what people paid for it (vastly increased health care both due to pollution and lack of physical fitness, the need for much larger and complex road systems and many other things) gasoline would probably cost $15/gallon and then they might have the beginnings of an argument.

But the fact that I'm paying for all that stuff even when I'm riding a bike and not contributing to the problem means that I'm paying for more than my fair share.

And almost everyone who rides a bike also owns a car, so the licensing thing is really nonsense as well.