Seems reasonable but consider, the area in question in vast and much of it is heavily forested, the grass is dry this time of year and they have fallen short in their maintenance.
Simple reason, the Sierra Club armchair environmentalists in San Francisco, Marin and San Mateo Counties kept suing PG&E due to the unsightly treeless and brushless fire break corridors that were on either side of high tension lines through the mountains and foothills. They didn’t actually go see them, but they saw photos of them and were offended by the unnaturalness of them, so they sued to put a stop to them. They won.
They also sued the state and national forest services to prevent them from clearing dead wood and underbrush that in previous centuries small naturally occurring fires would periodically clear out, fires humans artificially extinguished before they could do that natural job which would burn themselves out without harming mature trees, and in many cases were necessary for seed germination of those tree species. Native Americans often deliberately set those small fires.
When I was a boy, you could actually see across the Yosemite Valley floor through the trees. . . now, you cannot due to intervening deadwood and undergrowth which now would burn like tinder and destroy the mature trees. It’s there because more armchair "naturalists" got regulations passed prohibiting collection of firewood, cutting of brush, and, heavens forbid, controlled burns to clear it out! It’s been accumulating for the past 60 years in our forrests as we stupidly "prevent forest fires" which nature has handled on her own for millions of years, before anthropomorphic Smoky Bear ever showed up with his shovel and bucket!