Here is a May 2010, Toronto Sun article about Graffiti in South Etobicoke.
Officers at the November 13, 2010 Community Safety Seminar at the Police College informed participants that it is NOT outside gangs that are tagging our area. They indicated that it is people from our own neighbourhood.
Apparently Graffiti is a worldwide problem. For example, The Parthenon and other important Greek tourist sites are being bombed with Graffiti. Unfortunately the modern removal process is ruining the surface structure. The country is afraid that the graffiti is going to ruin their key source of income, the tourist trade.