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California fires have been 100% arson set by military aircraft.
The trees are not getting burned; just the houses and cars.
Take a drive through Paradise! Very few trees have been burned.
Trees didn't burn since the fires in Paradise were low intensity. Some of the Camp fire was low intensity even outside of town as well:
But there was also high intensity fire, "east of Highway 70 near Yankee Hill, Calif."
That high intensity fire with a strong east wind created an ember storm over Paradise. Any of the structure fires there could have been put out easily, but there were too many of them all at the same time.