So you need room for your umbrella and the rest of your newspaper? No problem, just use the space where a person could have sat, idiot.
Had enough of idiots ruining your commute? Snap a picture and send it in. Who knows, it might make you feel better, and perhaps even stop people acting like idiots if they know they might just end up on the internet. Send in photos/videos/stories to firstname.lastname@example.org.