Is it OK to steal Street Art?

I enjoyed this heated discussion on Flckr. My stance has always been that when you decide to put your art in the street, it becomes part of the urban climate, which includes the possibility of theft, as well and regular wear and tear from the elements. This guy seemed like he could have afforded to shell out the $2k to buy one from the gallery, but whatever. BTW be sure to see my photos on Flcker, a great resource that I think everyone should use.