No, not ALL of the mismanagement. Read your history. There was a President named Teddy Roosevelt.....then FDR.......
While TR and others since have expanded the reach of the federal 'responsibility' for the national forests, it's only been in the last two decades that the watermelon orgs and UN policies for 'sustainable development' have enhanced the destruction of the environment.
Conservation is not a dirty word; environmentalism and their priests are.