This is nonsense. Parks do prescribed burning all the damned time. That's the entire point of the USFS. They make sure fire clearings are all in the correct places and do their best to prevent large fires from breaking out.

Clearing out "debris" is an impossibility. Where would you put it? There's far, far too much land for that to be realistic. You'd need teams of millions of people and the logistics of such a thing would be insane.

Not only that but it would be an ecological disaster. All sorts of plants and animals rely on that debris to live. "The forest" isn't just the trees.