I agree also.
Planners and architects and the like seem to think they have a right to surround us with endless sterile expanses of prison-like concrete, brick and tarmac in which we are sequestered and regimented like rats in a maze, and expect us to actually prefer the machine-made deadness of such a hard and unfriendly environment (supported by people inexplicably opining that "it's dead and blank and boring therefore it is imperative for it to stay like that and anyone trying to change it should be shot"). It cries out for something like people with brightly-coloured spray cans to come along and at least partially reclaim it by injecting a bit of humanity.
All too often, also, the monotony is "officially broken" by a screaming procession of displays of lies, propaganda and psychological manipulation, deliberately intended to mess with people's heads so they spend money unnecessarily and/or vote for the Nazis. This, with its designedly evil intent, is more offensive than even the most lavatorial of graffiti, and anything which subverts it, alters it to make it more honest, or even merely obscures it is to be encouraged.