[ExGeeEye]

I read somewhere that it is mostly due to arson, and that seems credible.

Haven’t most California forest fires been attributable to accident or arson? Sure, they are prolonged and worsened by state policy, but as to the actual ignition...?

[GrandJediMasterYoda]

Last November ISIS issued a call for Jihadis to start wildfires.....

https://www.foxnews.com/world/isis-terror-network-wildfire-us-europe-threat-media-outlet

[RightGeek]

https://www.voanews.com/east-asia-pacific/australia-confronts-arson-bushfires-burn