That's just like saying "ashes don't burn, so to protect the forest from a forest fire, let's burn it all down!"
You don't realize, but it's a fact. Based on Yosemite National Park fire history:
Historically, fire was often seen as a negative force, but in recent years it has been realized that the benefits of fire in forests are numerous.
http://www.nps.gov/yose/parkmgmt/firemanagement.htm