Surely you've noticed that huge hunk of land over next to you on the maps called the mainland, haven't you? Lots of folks over here, like me, live 20 miles from town or more. Without a car, we'd starve.
Sure, it'd be great if we all lived in cities and sat on park benches fretting over the absolutely terrible state of aesthetics the cities have gotten into with so many cars -- wouldn't bikes and walking just spruce up the place immensely? -- but that's just not reality for us.