No-one here has yet made a case that it can.
I already did. Let me explain it, again, using my simple apocalypse example. Take these two phrases:
"Science has no evidence that the world is going to end any time soon."
And
"We ought not go around telling people that the world is going to end soon."
I will argue that the difference between those two statements is largely of relevance only to English professors.
To a sane brain, the two are going to be acted on equivalently.
Granted, there are those who do not accept the science. But, that is not relevant to the point. The point is that science can have an answer to a moral question!
How best to describe the attempts so far?
Perhaps I should not have used the word "stupid" so stupidly. But, the opposing arguments, so far, are not very strong. They are either:
1. Fallacies
2. Short-sighted
3. nitpicking on tangents
4. incorrect assumptions about my position
Etc.
Our methods of measuring many things could be more precise. But for 'health' and 'well-being', we must first decide what they are.
When you visit the doctor for a check-up he or she has lots of diagnostic measuring devices to estimate the health of your various physiological systems.
Granted, none of them are perfect. And, it would be naïve to assume total health could be placed on a single scale. But, at least we have some empirical basis to work from.
We also empirical ways to measure the wealth and (to a less accurate degree) the happiness of people, to estimate their "well-being". I realize that, often, these things are hard to define. But, one would also be naïve to assume we could not possibly improve in this field, as time marches on.
Just like your earlier moral examples, science makes a late appearance merely to measure, to provide facts to assist us in answering moral questions.
Late is better than never!
As our societies get better at this, science could be introduced earlier and earlier in the process.
A more objective position would suit an advocate of the scientific method, don't you think? It's almost as if you started with a conclusion and looked for ways of supporting it...
The former is, in fact, what I am doing. I am advocating the scientific method for finding answers to scientific questions.
Regardless of whether or not I like the conclusions.
If science, hypothetically speaking, actually demonstrated that eugenics was a viable solution for improving the health of the larger population, then in that scenario, it would be difficult to say eugenics was not moral. HOWEVER, science on the matter was already clear: It was not going to work.
For one thing: A better understanding of genes (even back before we knew what they were), revealed that the "bad traits" they were trying to eliminate were too systemic, in too much of the population, to be flushed out by sterilizing certain people who seemed to be symptomatic. I will see if I can find references for what was already known about genes, back then. But, of course, today, we know even more, and eugenics looks even less viable. The science was reliable, if those in charge paid attention to it.
I don't think anybody's arguing that It is a Bad Idea to Have All Relevant Facts Involved in Finding The Answer to Moral Questions, but I can only speak for myself.
I think that is enough common ground, that we can put away this silly argument.
But you hear 'science can define morality' (and on the hoof at that).
Anything can define morality: Religion can define morality. Darts thrown randomly at words on a wall can define morality.
In each of these cases, there is actually a tool
helping us define morality. But, in each case, we tend to leave out the words "helping us".
If a madman decided to use the random dart approach to define morality, no one would really think the darts, themselves, were actually making the moral decisions, if he said "Random darts can answer moral questions".
It is a Bad Idea to Have Science Answering Moral Questions because Science Cannot Determine What is Moral.
See my comments about the apocalypse example, at the top of this post, for how that distinction is largely one of language, and not of any practical concern.
I meant your argument not his.
My argument appeals directly to the methods and standards that directly define science.
A typical No True Scotsman fallacy goes like this:
Scotsman #1: Aye, no Scotsman puts sugar in their porridge.
Scotsman #2: But, I put sugar in my porridge all the time. I like it that way!
Scotsman #1: Ah, but no True Scotsman would ever put sugar in their porridge!
The above is a fallacy because the amount of sugar one puts in their porridge is not really a defining characteristic of what makes someone a Scotsman.
But, imagine the conversation like this:
Asian Man: I live in Asia, and all of my ancestors were born and raised in Asia (as far back as we have records for). But, I like to dress up as a Scotsman for anime festivals.
Scotsman: Ah, but no True Scotsman would live in Asia, have all of their ancestors come from Asia, and then only dress up as a Scotsman for anime festivals!!!
The above line is not a fallacy, because it is very clear that the Asian fellow was not a Scotsman, and did not even claim he was a true one.
In a similar way, the eugenics part of this discussion is going as follows:
Poster #1: A corrupted version of science was used to push eugenics, but it didn't work.
Poster #2: Ah, but no True Science would have been as corrupted. Science, used properly, gives us the tools and methods to build a much more reliable view of the world.
And, that is why I am NOT making a No True Scotsman fallacy. I am NOT appealing to the conclusions of science, but rather the methods and disciplines that directly define it.
Wowbagger, I read your posts, but I didn't see where you showed that science can be used to decide a moral decision. Maybe cite a post number, and I'll respond?
Post #22: lemurien posts a link about the Trolley Problem, and its relevance towards when it is right or wrong to take someone's life.
In Post #26: I offer a couple of examples: The unjust warnings of the "apocalypse", the forming of waiting lists for life-saving technologies, etc.
In Post #48, I answer the question about the morality of abortion, using science.
See also Post #55, where fls explains how the issue is really a lot more simple than religions would have us think.
Basically you are saying that it is a Bad Idea to Have Bad Science Answering Moral Questions. And I agree fully.
Emphasis added. I agree, too.
But, I would add that Good Science can and will do so, if we think it ought to or not!