I think the intermediate value theorem covers this. Meaning if a function has positive and negative values (good and evil) and it is continuous (I would assume a “vague boundary” or “grey area” or “goodness spectrum” to be continuous) then there must be at least one zero value. That zero value is the boundary.
It would indeed cover this if goodness spectrum was a regular function, not a set-valued map. Unfortunately, the same thoughts and actions can correspond to different shades of good and evil, even in the mind of the same person, let alone of different people. Often at the same time, too.
Unfortunately, the same thoughts and actions can correspond to different shades of good and evil, even in the mind of the same person [emphasis mine]
This shows that there is disagreement & confusion about what is good & what is evil. That no more proves good & evil are meaningless, than disagreement about physics shows that physics is meaningless.
Actually, disagreement tends to support the opposite conclusion. If I say fox-hunting is good and you say it’s evil, although we disagree on fox-hunting, we seem to agree that only one of us can possibly be right. At the very least, we agree that only one of us can win.
I think the intermediate value theorem covers this. Meaning if a function has positive and negative values (good and evil) and it is continuous (I would assume a “vague boundary” or “grey area” or “goodness spectrum” to be continuous) then there must be at least one zero value. That zero value is the boundary.
It would indeed cover this if goodness spectrum was a regular function, not a set-valued map. Unfortunately, the same thoughts and actions can correspond to different shades of good and evil, even in the mind of the same person, let alone of different people. Often at the same time, too.
This shows that there is disagreement & confusion about what is good & what is evil. That no more proves good & evil are meaningless, than disagreement about physics shows that physics is meaningless.
Actually, disagreement tends to support the opposite conclusion. If I say fox-hunting is good and you say it’s evil, although we disagree on fox-hunting, we seem to agree that only one of us can possibly be right. At the very least, we agree that only one of us can win.