Don't get me wrong, I also don't know the details of this story. I don't know how often their land type needs to be burned. I don't even know if there is trees in the area. I don't know if they put firefighters at risk by setting the backfires. I just know the lightning was doing the part it did before land management became a thing, and God knew what he was doing. My dad, who worked with Fire Depts said fires before land management could burn areas the size of states and Indians couldn't blame white man for it.
This is not true ecologically, historically, or theologically. Regular fire interrupts fuel accumulations that lead to catastrophic fire. Indians lit those fires for thousands of years and built what you apparently (and erroneously) believe was "Natural." G_d gave the job of managing the land to Man in Genesis 1:28 with the charge to bring it to fullness.
I suggest you top off that oil.