A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends otherwise. It is because wilderness is. Because it is the real world, the flow of life, the process of evolution, the repository of that three and a half billion years of shared travel.
All natural things have intrinsic value, inherent worth.
Their value is not determined by what they will ring up on the cash register, nor by whether or not the are good. For their own sake. Without consideration for any real or imagined value to human civilization. Even more important than the individual wild creature is the wild interconnected community - the wilderness, the stream of life unimpeded by industrial interference or human manipulation. Wilderness is not something that can be compromised in the political arena.