Uncared outer walls of Govt Offices

The other day while I was travelling in a BMTC bus, I happened to admire the colorful posters of Kannada movies, a few other language movies, some artist doing the the poster right on the compound wall using color chalks and some slogans of paarties. As the visual moved, I could see in some areas no posters and bare, dilapilated walls never having seen a coat of fresh paint or even whitewash from them day they were made. this was in total contrast to the joyous, colorful and collage kind of posters elsewhere. It made me wonder why the legislation to ban the wall writings, and posters on political parties, cinema posters on the wall? I feel they should be encouraged to use the outer walls of the state/central govt office buildings for this ultimate collages. It will give a unique visual kick to the casual glancers and may be inspire some budding artists some day to create a visual masterpiece. Even if it didnot do any such thing, atleast it coversthe ugly outer wall which never had a chance to bathe in the fresh whitewash or paint.