Considering that many passengers won't know the aircraft they are flying on or how many engines it has, far less what the paint scheme is, is there any point? The people who will see it most are airside airport workers and the odd passenger that happens to be looking out of a terminal window as it taxis past. Some will see it as just another instance of a minority issue given the 'in your face' treatment. Personally I think it is a very expensive waste of time.