Over the decades they learned that fighting wild fires is counter-productive. What's left is fighting only fires that endanger humans and human structures and leave the wild ones alone. It's the product of many decades of experience! Which is missing in your statement (the experience), that tries to make this into some weird metaphysical issue.

Just an example: http://www.washington.edu/news/2015/09/17/scientists-let-wil...

Did you know that the earth has a history of 400 million years without humans fighting wildfires? (No big plants before the Devonian period.)