There's quite a bit more nuance to the subject than that, but to boil it down as much as possible (as required by the limit on comment lengths), with Climate Change aside, wherever humans have an impact on a natural system, such as defending developed areas from forest fire, there is still a need for the maintenance effects of these natural agents.  It's similar to the trophic cascade that happens when you remove a top predator like wolves.  Look at the forest as a herd:  if you remove the means by which a system can regulate herd composition (ie: wolves targeting the old, sick, and weak), then another agent, such as disease, or other animals will step up and fill that niche, occasionally with highly visible effects.  Humans can potentially fill that disrupted niche by conducting proscribed burns and/or conducting selective thinning in an ecologically sound manner around human developed areas.