Okay so, I think some people have a fundamental misunderstanding of what urbanism is. It is not wanting to completely ban cars and planes, it's simply trying to design our cities so that people don't have to rely on Cars alone for transit. The whole goal of Walkable cities is simply to make our cities more walkable, it is not to make it so that walking is the only option. I don't think you're a bad person if you ride in a plane or drive a car, I've done those things, I advocate for more transit and rail because they don't exist to nearly the degree needed in the us and Canada and that is a problem. We need more rail, we don't need it to be the only option though.
Also like people will always have to cross oceans and that can only be achieved by planes, you can’t really build a rail bridge from London to New York