They are setting them .....I’m in Cali I can tell you stories of how farmers found pyro tech stuff underneath canvas tarps and then others seen what they describe as a laser shot hitting areas that explode and fires erupt, those bastards put the fire material in designated areas surrounding farm land , homes etc and then they hit their targets .. I have lots of friends in northern Cali with horror stories ..oh and past few years a lot of these hard working people had to give up there fire ins because it was nearly what they made a year ...lots of prime land was lost these past few years with fires .some lost everything including the burnt land that their homes once sat on