Morality is a Culturally Conditioned Response

I'm not saying you have to accept it as part of your own ethical framework

You simply have no basis at all to consider it unethical.

You managed to contradict yourself directly. Of course I have a basis to consider it unethical, and you've just identified it -- my own ethical framework.

This is the mistake you're making, and its the exact same one I was making back when I considered myself a moral objectivist. You think that acknowledging that other people sincerely hold very different values that they use to construct perfectly valid worldviews that you disagree with means that you have to somehow accept those worldviews as equal to your own. You don't.

To take a less emotionally charged example, let's say that you like peace, and quiet, and going to bed early. And let's say that you have a neighbor who likes staying up until two in the morning listening to loud music. You can surely see that his preference is not objectively wrong, nor yours objectively right. This does not mean that you have therefore to abandon your preferences and allow him to be loud and keep you awake -- you could try to work out an agreement with him, rally the authorities to your side, or simply move away.

I hoped it would be obvious, but I feel like I have to point out here that doing what he did is absolutely, unequivocally wrong.

From our points of view, yes. The key thing here, though, is that it is entirely possible it was not wrong from his point of view.

As for emotion, it is never used as the foundation for moral objectivism

It is, in my experience, the only foundation for moral objectivism. Consider your heartfelt cry that "what he did is absolutely, unequivocally wrong". That's not you making a logical argument. That's you appealing to emotion, expecting me (or more realistically, other readers of the posts) to agree with you simply because they share your revulsion. That's your entire rhetorical strategy. What's more, I think you're smart enough to know it, too.

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