This whole thing about politeness declining in our society as a whole is a very complex statement. I am not trying to sound like a arrogant know it all but I get tired of hearing this. Politeness isn't declining its evolving. Look at what manners were back in the Time of Jesus. You were expected to wash the feet of the guests and pour oil on them, pretty much bath them. Or in the Middle Ages when chivalry was running the show. Or in the 50s when the men would stand up every time a women entered the room. Saying that manners are getting worse and worse would assume that eventually there will be no such thing as manners. I think it just changes with each generation and the older generation will more than likely not agree with the new one. Society is not going to end up being some anarchical world where people run around farting in kids faces. Manners will always be around so don't worry about that. Now if in ten years from now we have hooligans leaning all over other people's cars then god help us all.