Although I like some of Banksy‘s work and also like some graffiti as an artform you can’t really defend the defacing of public buildings, transport and street furniture.
Banksy attempts to in todays Guardian.
“Melbourne is the proud capital of street painting with stencils. Its large, colonial-era walls and labyrinth of back alleys drip with graffiti that is more diverse and original than any other city in the world. Well, that was until a few weeks ago, when preparations for the Commonwealth games brought a tidal wave of grey paint, obliterating years of unique and vibrant culture overnight.”