Why Have National Public Land if Not to Protect It?

If we are no longer going to protect wildlife, endangered species, national treasures and wonders, why don't we insist that the government sell all public lands to prvate individuals or companies and be done with it?

During this administrations term we have opened public lands to loggers, ranchers and oil drillers, and the American people are not being compensated or seeing the use of their land reflected by lower prices for the goods produced.

Is there a reason for not just selling it outright, puttig the funds toward the nationa debt and stop wasting money on "studies" that this administration just changes anyway?

(This is the latest one: Land Study on Grazing Denounced )