What a confusing mess (arson in Greece). The Wikipedia article you linked to seems to imply that the 2007 fires were set simultaneously as a way to clear land.
Well, OK. The Greek government knows far more than I do. But setting those fires would have taken a certain level of coordination, more I would not have expected from people who just wanted to clear land.
(Disclaimer: Due to my jaded nature, I tend to see conspiracies everywhere. And I’m often right.)