That old myth again. It’s a blatant lie and has been debunked by credible people involved with firefighting, from Fire Chiefs down to local volunteer firefighters.
I said they have made it difficult not impossible. I think that is the frustration that is being directed at them.
That aside even if you took the opposite view and burned the National Parks like it was 1788, it would be the general population that would be up in arms about air pollution every year, so it is an unwinnable war for any government.