Veritas Aequitas wrote: ↑Sat Jan 30, 2021 5:19 am
2. Biologically, all humans ought to breathe, else they die.
In just the same sense, all humans ought
not to breathe, else they remain alive (or "else they do not die of suffocation").
I'm other words, this is not the
moral sense of "ought" that you're employing here, it's the "precondition" or prerequisite sense. "Unless x is the case, then y will not be the case." The problem here is that this tells us nothing about morality. For morality to be relevant , we need to be talking about something where at least two options are available, and where one option is what we ought to or should do versus the other option. So yes, option (1) if we don't breathe we'll die, and option (2) if we don't cease breathing we'll remain alive (ceteris paribus)--those are two possibilities with preconditions, but it tells us nothing about which option we ought to pick.
3. The imperative to breathe can be tested empirically via biological experiments.
You can show that there are physiological reactions that are directed towards breathing, but that in no way tells us that we ought to breathe rather than not breathe, that we ought to follow those physiological reactions rather than fight them and stop breathing.
Again, we have to be talking about at least two options, otherwise we're talking about something where there's no moral choice to be made; there's no other option to follow regardless of what anyone might want to do.
"Ought" in the above do not refer to a rule that is enforceable by any external authority, rather 'ought' in this sense = proper, correct, in order in alignment to being-human.
It's not a "proper" or "correct" sense but a precondition sense. It's not proper or correct to breathe versus not breathe.
The moral fact [ought_ness] 'no human ought to kill humans' can be verified and justified empirically and philosophically just like the above procedures
Which means that it can't be verified/justified empirically, because you did no such thing above with respect to anything having to do with morality.