Smaller regular fires burn at lower temperatures and they clean up basic debris. If we fail to let the lower temp fires clean up debris the debris tends to grow. When there is more of that the fires burn at hotter temperatures and cause more damage. To avoid the hotter temperatures the debris needs regular cleaning. The natural method of that is fire.

That's what numerous articles written on the topic from experts have said.

Or forest mismanagement.

I was in a northern california campground a few years ago and was kind of blown away- great piles of dead trees and "no collecting firewood" signs.