Also, most people apparently don't understand the distinction between "wildfire" and "firestorm". Since upwards of 97% of wildfires are actually human-caused these days, of course a human has to be present for that to happen. No humans means far fewer wildfires.
But a lot of what we've been seeing lately are actually firestorms, where a single structure catches fire and then that spreads uncontrollably to the next structure and so on until everything flammable is basically burned out. Firestorms happen because there are few if any resources available to put the fire out while it's still small. So while the original source of ignition may very well have come from a wildfire, the firestorm can keep burning and spreading long after the wildfire itself has basically played out, at least in that immediate area.
And no, climate change has little or nothing to do with this.
I agree - controlled burns are effective at keeping brush at manageable levels, and fire is a natural part of the forest ecosystem. And part of California’s climate. Developing too close to the wilderness edge is putting more human lives at risk. (I own farm and forest land, and am involved in conservation and restoration; I’m familiar with the challenges.)
But Climate Change is rapidly becoming the dominate factor for one simple reason: hot, dry, things burn. And Climate Change is making things hotter and drier.
Physical wetness, though, may make quite a bit of difference, especially when it comes to a fire actually igniting to begin with. But even that may not matter so much when it comes to things like lightning strikes, which may be in the tens of thousands of degrees.
So, for example, if the temperature might normally be 70F but instead is closer to 100F, that small difference is minimal compared to the temperature of any flames. But it might make a huge difference to someone fighting those flames, unless maybe they are right in the thick of them.