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Uhm... I explained why it's the case, right in the section you quoted.
And I gave a counter-example of a fact whose basis--whose underlying principles--we do not know, but we still know how and when to apply it, what exceptions there are, etc. So if you're saying there's a principle that generally holds--something like "we must know the basis of a fact (the answer to the question why the fact obtains) to know how to implement it amidst the vagaries and variances of everyday life"--it seems that principle is not universal. What makes you think it holds up in this case?
For example, which of the 6 remaining rules of the Decalogue tell us whether the following are moral or immoral?
- pedophilia
- incest
- totalitarianism
- assault
- domestic violence
- rape
- statutory rape
- consuming marijuana
- consuming opiates
- prescribing opiates
- donating blood
- donating organs after death
- donating money or time to charities
- voting
- paying your taxes honestly and on time
- using loopholes to reduce your tax burden
- keeping your dog on a leash
- treating everyone as equal under the law
Heck if I know. Why are you asking me? I never said I am a proponent of the Decalogue, or that I think it's a good basis for a moral system (and for the record, I do not think it is). I was asking you about a claim you made that doesn't seem to be right, as far as I can tell--though I am genuinely curious whether you've got an argument for it.
I.e. it is very clear that "You shall not murder" is completely devoid of the necessary nuances to develop any sort of practical ethics.
Or: The foundational principles of an ethical system is analogous to the axioms of your geometric or mathematical system. If the only thing you know is that "π is 3.1415926...." that doesn't tell you the definition of a circle, or a plane, or a point. You won't get very far applying π to Euclidian geometry if you don't know Euclid's postulates.
This last bit, I think, gets to the heart of the issue, but it seems to me it also shows you've confused two different issues. Notice that Euclid's postulates and axioms are also not the basis for the fact that the ratio of the circumference of a circle to its diameter is 3.1415926... Rather, it simply seems to be a brute fact that pi is the ratio of circumference to diameter. However, as you correctly point out, we know how to apply this ratio, when it has exceptions, etc. because we know other things as well--not because we know the basis for why the ratio pi is what it is.
So it's not so much that we need to know the basis for why it is wrong to kill for the principle "it is wrong to kill" to be useful, but rather, we need to know lots of other truths as well, including not only truths that describe a given situation in which the rule against killing might apply but also truths that compass the relations between one moral truth and another. None of those other truths need be some underlying foundation for why it is wrong to kill--it may just be a brute fact that it is wrong to kill in the absence of some fact creating an exception. Perhaps it was the idea that the Decalogue contains rules that obtain in all instances where another more specific rule does not create an exception--again, heck if I know--the point is merely that such possibilities cannot be ruled out.
Now of course, that means that your criticism of the ten commandments as rather too "bare-bones" to be useful as a moral code is correct--we need to know rather more than ten moral truths. The principle "it is wrong to kill" if taken to mean "it is always and in all cases wrong to kill" is probably false, so as a moral code, the Decalogue probably fails. Does it fail as a basis for morality? Well, I think it does, but not for any reasons that you've brought up. Perhaps it might have been the case that, in the time and place in which the Decalogue originated, someone who devoted herself to its commandments would have been so oriented, psychologically speaking, toward goodness and virtue that she'd also understand the various exceptions that might arise. Again, I do not know whether such is the case or not--it just doesn't seem like the possibility is so easily dismissed.
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