Who knows how many of those 42 people charged are actually guilty? I imagine the Greek cops are under a lot of pressure to find somebody to blame.

If memory serves, there were almost 100 wildfires around Greece, so its plausible that a bit less than half of them were deliberately lit.

In Australia, about half of all bush fires are either deliberate or suspicious. Only 13% of our 62,000 bush fires each year are from natural causes.

(Australia is a lot bigger, drier and hotter than Greece, and our trees are evolved to encourage bush fires. 62000 bush fires in Australia is not unusual. 100 in Greece is probably shockingly high.)

Arson is a lot more common than most people realise.