They argue for "public transit, walking and bikes" according to their website. Bikes are mainly how they choose to protest, but they want accessible public transit. Your last sentence is phrased like a "gotcha" but seems like a disingenuous way to say that young members of the community are organizing over this cause.
Or maybe would be disingenuous to think that public transport would cover for all places a car today can go. The world is not only made of urban sprawl.
