Philosophically provocative. Leaving large areas of wilderness unaltered is the only means of ensuring that this could be the case. However, it also requires us to remain humble enough to simply keep out, stay away, and revere Nature left to her own devices. A grand thought.
I agree it's best to leave alone, but I also think it's best to 'know' of every living creature on this Earth. To know of creatures that we knew nothing of, gives us added respect for them.