We should at least try this while the fires are going even though it's expensive. There's no wildlife in the middle of a fire other than rodents under ground. Just bomb the area that's burning wider than the blast radius.
In the U.S., cultural resource protection is one of the considerations in wildlands firefighting, and a significant number of wildfires in the U.S. west occur within designated Wilderness areas where minimum impact suppression efforts are required by law. This means, e.g., you can't run a bulldozer through to cut a fireline in Wilderness, and in some cases can't even drop slurry because it might cause permanent staining on rock outcrops, damaging a natural resource. Dropping weapons-grade bombs is going to be a non-starter, as it should be.