This. There are studies supporting this conclusion [0]: "Without adequate prevention measures, forest debris can build up, fueling a bigger, more devastating fire the next time around."

And this [1]: "This leaves authorities with a difficult problem. After decades of successful wildfire suppression, we can now expect fires to be far worse when they finally happen."

[0] http://news.mit.edu/2013/forest-fire-management-1120

[1] http://www.bbc.com/earth/story/20160722-why-we-should-let-ra...