Obviously, when I say it's inappropriate to ride on sidewalks, I'm not talking about isolated cases. I mean, if you ride in a suburb where nobody ever walks, and there's rough road, construction or whatever, of course, there's nothing wrong with taking the sidewalk occasionally. There are always exceptions to any rule. I'm just talking about people who make a habit of it, as many do. In my experience, most adults who ride on the sidewalk think they own it. Pedestrians (and who isn't a pedestrian now and then) should not have to depend on some joker on a bike to avoid them. Bike go too fast for that.