Indeed. Destruction of an environment, in a way that will never affect directly (because they would visit it and delight on the view) or indirectly (because it purifies the air they breath) any sentient being (humans, transhumans or aliens) doesn't call any strong moral judgment to me.
The only reason for which I would make a moral judgment in that case is because I do have a limited form of empathy towards animals, not as strong as towards humans, but that empathy towards animals makes me judge as unethical the destruction of their environment. But then, it's again empathy.
Yeah, there's a distinction there that seems to have gotten lost. Nuking the moon seems about as good an example of environmental destruction without short-term externalities as I can think of, and indeed it doesn't trigger the same moral instincts in me as, say, nuking a national park would.
That doesn't seem to bear directly on the OP's main point, but a lot of the other supporting examples seem to show similarly sloppy reasoning.
The following are extracts from the paper “Is Empathy Necessary For Morality?” (philpapers) by Jesse Prinz (WP) of CUNY; recently linked in a David Brooks New York Times column, “The Limits of Empathy”:
1 Introduction
2 Is Empathy Necessary for Moral Judgment?
3 Is Empathy Necessary for Moral Development?
4 Is Empathy Necessary for Moral Conduct?
5 Should we Cultivate An Empathy Based Morality?
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