Banksy- vandal or artist?

Banksy is nickname of well known graffiti artist. His real name and look are mostly unknown. A lot of people query about him, if his works are "art" or rather vandalism, becouse his graffity are placed on public or private spaces without permission. But, from the other hand his art has very intellectual nature, what for many brand him a true post modern artist. 

Though Banksy’s identity was well guarded, he came to notice as a freehand graffiti artist in 1993. Using stencils since 2000 to enhance his speed, he developed a distinctive iconography of highly recognizable images, such as rats and policemen, that communicated his antiauthoritarian message. With wry wit and stealth, Banksy merged graffiti art with installation and performance.