When a person hires someone to paint a building or a house, it is a contract. In a contract, you have the consent of the owner. Whereas graffiti artists take it upon themselves to change the appearance of someone elses' property. Many people spend thousands of dollars painting and repainting graffiti on their walls, windows and fences. But that window cost as much as having a good used car.
People work hard to own and buy nice things.
Therefore, it is painful for something you've worked so hard for to get destroyed by graffiti vandals. Moreover, it is scandalous when graffiti artists come back and redraw what was just covered up with fresh paint the previous day. You cant paint on them. Graffiti artists need to understand they are sharing the community with poor and rich families, families who can not always afford to keep their homes graffiti free. Graffiti has its many forms of beauty, the colors, emotions, and the imagination.