So the minute I got this gig writing I Heart Street Art, the SFPD announced a major crackdown on graffiti, and suddenly everybody's asking me for the answer to the eternal question: How do you reconcile your appreciation for street art with the fact that it is vandalism?In the back of my mind, I guess I've always thought it had something to do with level of creativity. If somebody goes to the trouble of inventing a cute character like Girafa, and depicting the character in a variety of clever in