Perhaps you can explain to us why this is supposed to be a bad thing that supporters are likely from the fossil fuel industry and others.
For a lot of these lands, mineral interests are likely those that could profitably exloit the land. If the tree huggers want to “protect” land, they would be welcome to buy it as well. Ducks Unlimited has been doing this for years to protect migratory bird habitat.
These lands are held in trust for the citizens of the US, and managed as multipurpose in accordance with congressional acts