Rob Bishop actually said...

the core mission of the Park Service is to protect the great natural and historic components of our National Park System for the enjoyment a...

If we don't do that, then there is no purpose for having national parks.

I encourage that, as you are making a criteria for how to judge those in the future, I think that is very wise.

protecting the core mission of the Park Service means that in a time of fiscal constraint, we have to make choices.