More than any other form of art or design, street art triggers at least as much discussion about ethics as aesthetics. This is a sign of vitality, actuality and the ability to comment on society and raise debate.
When ethics is missing, aesthetics is often reduced to taste, or authority given to the experts. Street art gives back to the public the autonomy to make up their own opinion, while spurring reflection.
Street art, with its intrusive exposure and association with illegality, forces society to have an opinion that transcends the simple pretty–ugly dichotomy. A quality much needed.