On the one hand, spraying colors on walls is a way for youths to express themselves and be a part of a team. Young people meet each other, make friends and evolve their drawing capacity.
Furthermore, graffiti helps cities look attractive. The walls around are usually painted grey or white and graffiti gives them life! That is to say, they seem more good-looking.
Moreover, as a way of expressing themselves, it helps the youth to release their anger. Graffiti is forbidden and when something is forbidden it is more attractive for young people and they outburst by making art.
On the other hand, because of spraying, government incur huge costs and have to pay for them, immediately. In addition, these people who do graffiti sometimes deface properties. Defacing properties is illegal and punishable by the law. Another disadvantage is the fact that sprays pollute the environment and it is harmful for our health.
Taking everything into consideration, graffiti has its pros and cons. I firmly believe that it is a form of art and it should not be considered as vandalism. Although it might be a violation of property rights, we can maintain that graffiti is a valid art form which reveals artistic talents that worth to be displayed.