Let me preface this by saying that keeping up with research is my job. Not preaching to anyone here, just summing up some research...
There is an argument in academic research that the former 50-year practice of snuffing out all fires as soon as they started has led to as unnatural a landscape in forests as it would be if they were burned out completely. The resulting underbrush, mast, needle and leaf debris pileup makes for a much hotter fire and a slower-advancing flame front when it does eventually burn, and ******* reforestation because seeds that would have survived a quicker, less hot fire die and also because the slower advance of the flame front kills more trees than a quick fire would.
As a result of that research, the US Forest Service has modified its approach to fire suppression. The Forest Service is now more about containment in situations where that is appropriate, and is also setting many more underbrush clearing fires than it used to.
It's also been postulated that the fires themselves may be a form of natural "reaction" in the ecosystem to a warming climate, since the smoke shades out sunlight.
Less well studied is a theory that human expansionist activity itself in the Western region is helping to drive even hotter weather there due to the increase in hard surfaces that retain heat, a "heat island" effect that has been well documented in cities but is not well understood in regions, and increased rapid runoff of what water is available - which deprives it of a longer-standing cooling effect.
All that said, it is abundantly clear that the longstanding presence of drought that is uncharacteristic in the weather pattern history of the West in the past 5,000 years is the main cause of the ease with which major fires erupt and expand. And rather than being a transient weather pattern like shorter-lived droughts, this longer duration drought is being driven by climate change. Since climate operates on a much longer "wavelength" than weather, the long-term pattern is not likely to subside even if it ebbs and flows in coming years.