Imagine the forest at ground level. It is tender made up of two-year-old decaying undergrowth to give a fire a quick start.
Just above that is fine, brittle, kindling made up of one-year-old undergrowth, which gives the fire instant heat to start this year's undergrowth just above it, making a fire so hot, so fast it is impossible to keep it out of the trees.
Proper cattle grazing in the forest keeps the undergrowth to a manageable level in the event of a fire.
The Bureau of Land Management and the Forest Service have systematically removed cattle from the forest.
Look to Arizona to see the results and, yes, we will have fires like that in California for the same reason.
Utilize that God-given cattle feed and grow beef not fires!