I am no firebug but unmanaged forests go through a cycle. When enough detritus stacks up at the bottom a fire comes through and destroys what is there. Things then regrow. Cycle of life kind of thing.
Don’t like that? Manage your forests. (Californidiots)
Think of how fast one dried up Christmas Tree can go up in flames. Now picture 30-50 years or more of brush that still has sap and resin in it and add a very dry summer. Then add liberal EPA laws.