What is the indefinite integral of sin(x)/cos(x)?
Cross the nation asking that question of everyone you meet. What would you expect for answers?
Many would simply say “I don’t know”. Some would have a pocket calculator or intelli-phone and look up an answer. Some would try to remember and give you an answer. Some would misremember and give you an answer. But you wouldn’t really know who was right and who wasn’t. So of course, you would conclude that it must be merely a matter of opinion.
But then if you were to ask of morality, religion, national or international politics, or psychology, suddenly everyone becomes an expert and offers an answer. Again, you assume that it must be merely a matter of opinion.
When you see someone using a machine to find the answer to the math problem, you assume that they probably have a “correct answer”. You are aware of machines that can give exact answers reliably. So you tend to trust those answers as being objectively true.
But note that a simple math equation is nothing compared to the sophistication of a question of human behavior and interaction, such as morality. Yet somehow so very many people consider themselves to be as much an expert as anyone else. They don’t have a machine to tell them the “correct answer”. Although literally as we speak such a machine is in the works. Not long from now, they will be able to consult their intelli-watch and give you the “correct answer” to even your questions on morality. And you will know they are correct because the machine told you so.
You presume that a machine can handle a math problem. But at the moment, you probably think that a machine could never handle a morality problem. Yet you expect ordinary people to handle human behavior or morality questions and yet not math questions. And when they don’t give consistent answers, you conclude that it must be just a matter of opinion.
Is it at all true that because you can’t get a consistent answer, there must not be an objective answer? Even if you got a consistent answer, is it true that such an answer must be correct? Can you even gauge if there is a correct answer simply by how people respond to the question? All people have been wrong throughout history concerning just about everything. Yet you still know that there are actual objective truths, “correct answers”. And you now trust machines to give them to you, more so than people. Why is that?
Machines use logic, predefined concepts, and relationships to reliably deduce answers. And that seems to make them correct far more often than people who do not do that. When people have their handi-dandy intelli-watches, they can rely on getting consistently correct answers even to human behavior questions. And for the same reason. But until then, you are stuck with people being experts at things they have never even studied and you presuming that all such answers are merely subjective. But does that really mean there was no objective answer to be given? And how would you discern it even if it was given?
The existence of objective truths has nothing to do with the subjective opinions that people offer, no matter how many offers are given. But you won’t believe them until some machine tells you the “correct objective answer” because you can’t work it out for yourself “down here”, so you leave it up to those “up there” to provide you with a machine, after which you gain ultimate confidence in the objective truth of the matter.
Of course some of us do go “up there” and work it out for ourselves and find the objective answer for ourselves, but you don’t know that.
And as far as your John and Mary incident, as I told you from the beginning, such things must be handled by detail of the circumstances. Note that the math problem was about an indefinite integral. An abstract answer can be given to an indefinite integral. But a definite integral, a real life problem requires the details of the circumstance and cannot be answered without them.
There are indefinite morality questions, answered in abstract terms, and definite morality questions, answered in specific terms. But for every objective answer received, you should expect thousands more subjective opinions offered. You cannot know the difference. And you cannot know if the machine has begun giving intentionally wrong answers so as to persuade.
Your opinion concerning objective morality does not alter the objective truth of objective morality, does it.