I think you are a moral relativist not a moral nihilist as you claim. You are probably only an existential nihilist, but your moral views aren't compatible with moral nihilism.
The platypus does not care how it is classified by biologists. It exists and is well defined. And so am I.
Surely there would be some correlation between empathy and vegetarianism. Empathy is measurable by way of psychological testing. Surely you wouldn't believe something is obvious without evidence to back it up?
I don't know how to demonstrate a subjective experience.
Morality according to your claims doesn't exist. How do we perceive something that doesn't exist?
Vision is not objective; it is subjective. Your vision exists subjectively. Can you perceive it?
Existential Nihilism: Life has no meaning or purpose
Moral Nihilism: Morality, right and wrong do not exist.
Can you demonstrate either of these to be true scientifically?
Again: null hypothesis.
You claimed nihilism as a truth.
Do leprechauns exist?
The colloquial way to answer this is to say that you reject or suspend belief in leprechauns because of insufficient evidence.
The formal way to answer this is to make the negative claim that leprechauns do not exist. Being a negative claim, there is no burden of proof for this position.
When atheists say that there is no God, they are (hopefully) speaking in the formal sense.
As for nihilism, it is nonsensical to evaluate it as true or false. Nihilism is a position that is taken with regards to true/false claims. Let's please not get into "Is 'This sentence is true' true?"
Any logical system, such as mathematics as defined under the Dedekind-Peano axioms, is just a list of claims which follow logically from a list of unsubstantiated assertions (the axioms). *If* we grant the axioms, *then* the whole world of mathematics follows and we can show, among other things, that 2+2=4. But the axioms themselves are not intrinsically true or absolutely true. They're just conditionally true.
To illustrate:
We have the notion of a set which is undefined, and then we assert that the empty set, {}=Ø, actually exists. Then we assert that for every set A there exists A union {A}, which is the successor function. Then we define Ø=0, Ø union {Ø}={Ø}=1, {Ø} union {{Ø}}={Ø,{Ø}}=2, and so on where each natural number
n is a set containing
n elements. (Incidentally,
n is the ordered
n-tuple of
n empty sets.) Lastly, we define addition as a function +:
N×
N-->
N such that +(
a,
b)=
a+
b=(
b successor iterations of
a).
What, from above, is "true"?
What, in all of existence, is "true"?
What does "true" even mean?
"True" is a label that we arbitrarily put on things. It has no meaning beyond that.
Hence nihilism.
Questions of meaning or morality are not even admissible in science in the first place. Also every time you use the word obvious I'll take that as an assertion unless you can back it up with evidence. I could say it's obvious that God exists, but it's not really a useful way to argue.
Fine. I don't intend to prove subjective claims. That's why I can only assert that it is obviously wrong to kill. If you disagree - if you truly disagree - and if you are motivated to kill me, then there will obviously be a reckoning between the two of us. There's nothing I can show you or explain to you to prove that killing is wrong because, objectively, it isn't.
You shouldn't believe in any absolute truth - even nihilism.
Please tell me what truth of nihilism it is that you think I believe.
The scientific method doesn't give any absolute truths, you only can tentatively accept things as true based on current evidence and the accepted consensus on the interpretation of that evidence.
I would prefer to say that I have degrees of certainty. I'm more convinced of the existence of black holes than I am of cosmic strings, for example. We don't have a theory of quantum gravity yet, so our understanding of black holes is fundamentally incomplete, but there are good reasons to believe that black holes exist and there is indirect evidence to substantiate their existence. Cosmic strings, on the other hand, are entirely theoretical and are suggested as an
ad hoc explanation for unexplained gravitational behavior.
I think if you bother to research the history of science you will find that the scientific method has its roots in philosophy. Without philosophy we never would have arrived at the scientific method. Mathematics is a seperate field.
If that's so, then congratulations to philolsophy. Science, along with mathematics, would be two successes out of many failures.