You are your own evidence that objective moral values and duties exist.
I will tell you a true story and then ask you a question.
"KCfromNC, a man in Alabama recently jumped on a school bus and pointed a gun at the bus driver and said something to the effect that he wanted some kids off of the school bus. The bus driver said no, and he was shot dead for refusing to give up any children from the bus. The shooter then kidnapped a young 5 year old boy and held him hostage for a week. After negotiations broke down, the man refused to give up the child and he was killed:
My question is simple:
Were this man's actions wrong even though he was of the opinion that what he was doing was justified by his desire to have some kids off of the school bus?
Your answer in the affirmative will be your evidence. The evidence will come from your own mouth that at least one objective moral value or duty exists.
If you say he was wrong even though it was his opinion he was right, then you are saying he was objectively wrong. That is all that objective in this sense means. Nothing more, nothing less.
If you do not say: "Yes Elioenai26, this man was objectively wrong", then I have a followup question for you:
If he was not objectively wrong, meaning, wrong even though he thought he was right, then what was he? How would you categorize his actions? If he was not wrong, what was he? Were his actions:
A. Morally neutral, that is, the man's actions have no moral component at all for no act is inherently either moral or immoral. These concepts do not refer to -Nihilism
B. Morally commendable and good?
Or...
C. Your opinion that he was wrong. If this is your view, then I have a followup question:
Followup question 1: If it is your opinion that he was wrong, and it was his opinion that he was right, then how is arbitration between the two opinions possible? There are only two possible responses:
Response R. - The societal judiciary system decides who is right and who is wrong. But this simply pushes the issue one step further back, for what is a society, but a colletive group of individuals? If no one view is objectively right or wrong, then who is to say that the majority view or general consensus within a society is the view which should be legislated? It seems that there would just once again, be opinions. In a hypothetical society, you have one-hundred people. Sixty of the one-hundred believe that school bus shootings are ok, and forty believe school bus shootings are bad. Who is to say that the view of the sixty should be preferred over the minority forty? The relativist would say, well the majority rules! But that just leads to the next obvious question: "Who says?" Who says the majority should rule over the minority? If the view that the majority should rule over the minority is itself an opinion with no objective referrent, then the minority could say that they should be able to rule over the majority. Who determines whose rules are legislated? Some would say well, hmm...Aha! Whichver view is based on empathy and sympathy and reason and which is more conducive to human flourishing should be the one accpeted. But this obviously leaves the question looming large: "Who says?" Why should those who disagree with that opinion agree with it? If sixty of the one-hundred say that the view which fosters happiness and reduces suffering should be accpeted, and forty say that their view which fosters greed, self-satisfaction, and fulfilling one's wildest fantasies and pleasures should be accepted, then: "Who says?" They are all opinions, and since there is no objective standard to which one can appeal to to judge the two opinions, then what are we left with? But surely one would say: "We should encourage the view which causes our species to survive and reproduce!" But once again: "Who says?" Why should that opinion be seen as being preferable to the opinion of: "eat drink and be merry, for tomorrow we die!" Who says we should act in a way that is conducive to our survival as a species? That in itself is just an opinion, like the opinion that one should live for the moment and not care about tomorrow, for tomorrow is not even promised. Everytime someone in a relativistic society comes up with a reason as to why one opinion should be preferred over another, the question will always come up: "Who says?" Some may even condede the point and say: "Well, it should be self-evident to people that regardless of their opinons, that we should live in a way in which it helps us, as a society, do away with human suffering and a way which helps us be happy!" But look at what this person just said. The moral relativist confesses here that it should be self-evident to people regardless of their opinions that we should live in such and such a way. But guess what this moral relativist no longer is when he speaks this way? HE IS NO LONGER A MORAL RELATIVIST! HE IS AT THE MINIMUM A BORN AGAIN MORAL REALIST. HE HAS FINALLY SEEN THE LIGHT!
Response S. - There is no way to adjudicate between the two, because all opinions are equally valid. In light of the above, this is the only response that one can give if they are consistent moral relativists. And look at what it leads to. It leads to the conclusion that there actually is no objective moral values and duties. And since the concepts of moral and immoral exist only if there is some objective standard by which they can be measured, as is demonstrated in response R., then the words moral and immoral actually have no meaning. They are just words void of content. This leads us back to A, moral nihilism.
If you say A. Then I can speak for every parent and say that I would not want you as a school bus driver or anywhere near any of my children or any other children. I would not want you to be my doctor, a law enforcement officer, a judge, or a teacher. I would not want you to be my neighbor, an airline pilot, a lawyer, a child care worker, and any other profession where people's lives could directly or indirectly be affected by your sociopathic view. You would also, by saying A. lose any right to make any moral judgments ever again here in this forum. You would never be able to say anything was wrong or evil or bad. You would never be able to make any moral pronouncements at all. For as a moral nihilist you assert that morality does not inherently exist, and that any established moral values are abstractly contrived. Moral nihilism, also known as ethical nihilism, is the meta-ethical view that morality does not exist as something inherent to objective reality; therefore no action is necessarily preferable to any other. For example, a moral nihilist would say that killing someone, for whatever reason, is not inherently right or wrong. Other nihilists may argue not that there is no morality at all, but that if it does exist, it is a human construction and thus artificial, wherein any and all meaning is relative for different possible outcomes. As an example, if someone kills someone else, such a nihilist might argue that killing is not inherently a bad thing, or bad independently from our moral beliefs, because of the way morality is constructed as some rudimentary dichotomy. What is said to be a bad thing is given a higher negative weighting than what is called good: as a result, killing the individual was bad because it did not let the individual live, which was arbitrarily given a positive weighting. In this way a moral nihilist believes that all moral claims are false. *Wikipedia*
If you say B., well then, all I can say is, may God help you...