No no no no no. Ok, going to try one last thing to get you to see why you're wrong. I can't keep wasting time like this.
You've shown that my example is wrong to you, subjectively. You haven't shown that the example is wrong objectively.
I have shown that the example was wrong independent of my view. Science showed that his actions of killing would cause his own and others well being to suffer. That science came from psychology, human behavior science and the laws of cause and effect which tell us certain truths about what happens when we act in certain ways. Killing has a ripple effect on the life of the killer and on the victim, their family and society which produces a range of negative outcomes. This has been scientifically verified. Remember objectivity has to be independent of me or any human and the science is independent.
The wrong is because all humans know that there are certain moral positions that are better for producing a stable and happy society and killing disrupts that. That is why we have laws to stop killing. It stands to reason. This is explained below.
Here's your task:
Objectively equate the words "harm" and "wrong".
I have already done this and its is done below again as stated from MR Harris's article which you should have read when i posted it earlier.
If you can do that, you can start to demonstrate that objective morality exists. If you can't, then you can't demonstrate that objective morality exists.
And here's the thing, you can't bring up science, because science can only demonstrate "harm" (although that's even a dicey position to take). Trying to imply that science can determine right or wrong involves your subjective opinion in equating "harm" and "wrong".
If someone uses the moral system "What is right and good is what benefits me personally.", then the word "harm" equals "wrong" to them primarily when it's applied to themselves, not universally. In other situations, "harm" does not equal "wrong" to them.
I have already done that. You need to read this link and then address what it says. It answers all your objections.
Morality and values depend on the existence of conscious minds -
and specifically on the fact that such minds can experience various forms of well-being and suffering in this universe. Conscious minds and their states are natural phenomena, of course, fully constrained by the laws of Nature (whatever these turn out to be in the end).
Why Science Can Determine Human Values – Opinion – ABC Religion & Ethics (Australian Broadcasting Corporation)
The author states morality cannot apply to something non human like a rock. So here we have established a basis for applying morality. If it applies to conscious minds then conscious minds can experience harm and this falls within the laws of nature.
Therefore, there must be right and wrong answers to questions of morality and values that potentially fall within the purview of science. On this view, some people and cultures will be right (to a greater or lesser degree), and some will be wrong, with respect to what they deem important in life.
That makes these right and wrong answers of morality moral truths.
So this is where your objections come in which are all answered in the article.
Some people worry that any aspect of human subjectivity or culture could fit in the space provided: after all, a preference for chocolate over vanilla ice cream is a natural phenomenon. Are we to imagine that there are universal truths about ice cream that admit of scientific analysis? The author states technically yes.
Science could tell us why some people prefer chocolate to vanilla and why no one would like aluminium as an ice cream flavor.
These are ultimately questions about the human brain. There will be scientific facts to be known here, and any differences in taste among human beings must be attributable to other facts that fall within the purview of science. If we were ever to arrive at a complete understanding of the human mind, we would understand human preferences of all kinds.
However, morality and values appear to reach deeper than mere matters of taste - beyond how people happen to think and behave to questions of how they should think and behave. And it is this notion of "should" that introduces a fair amount of confusion into any conversation about moral truth.
So the author states here that there are moral truths and makes the case.
If there are truths to be known about the mind, there will be truths to be known about how minds flourish; consequently, there will be truths to be known about good and evil.
Mr Harris addresses all your objections if you read what he says
Why Science Can Determine Human Values – Opinion – ABC Religion & Ethics (Australian Broadcasting Corporation)