I think we are evolved to find some As better then Bs. It takes a very weird set of conditions for me to like the idea of being [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse]inously tortured, for example. Maybe God created this instinctive repulsion. Or, maybe it is part of our evolved responses to certain physical conditions.
Evolution has given us certain behavioural predispositions. These may or may not be appropriate to our current social and cultural milieu, which has caused major changes in our lifestyles in a timescale too short for significant evolutionary adaptation.
Fortunately, evolution has also given us the cognitive flexibility to modify, sublimate, defer, divert, and reinterpret those predispositions and their behavioural implications. Ethics is the study of how we should do this and why. The fact that the subject of ethics exists at all is an indication that there's no simple or consensual way to go from the 'is' of the evolutionary context to the 'ought' of our contemporary cultural context.
So, ought you believe Hume?
I think it's best to read what deep thinkers have said and make up your own mind - or keep an open mind if you feel the arguments are not decisive. Hume was the seminal contributor to this field of thought, so his arguments are worth serious consideration.
... if we can go from doxastic or epistemic conditions to oughts (I ought to believe in such and such etc. because of such and such) why not moral ones?
You tell me - as I understand it, that's how moral positions are usually justified.
... youre saying evolutionary pressures do not create health to be experienced as a "good" or a "preferable" state of being?
No, I'm not saying that. I'm saying that "... (good)
health being good for the person whose health it is" is tautological.
Good things are good, bad things are bad; and yes, many things we consider good or bad have an evolutionary basis.
Just because the ethical world is complicated, its difficult to do a simple assessment on many issues. But that doesn't mean we're completely in the dark.
Indeed - we have ethics and experience to guide us.
Or, because we find certain things to be better. Do you have, for instance, any sympathies with assisted dying campaigners who suffer intolerable pain? Are they deriving an ought from an is? Are you?
What is 'better' is the question. But sure - we inevitably derive ought from is because we only have our predispositions and a lifetime of experience of what is (or at least what appears to be) from which to derive them.
The question is whether it can be justified without begging the question. I have sympathy for anyone in intolerable pain. My view is that in some circumstances assisted dying is a Good Thing. Some people disagree to the point that
they would take a life to stop it... This is where ethics
ought to come in
There is probably some mutual interplay?
That's what we like to tell ourselves - but that may just be the way the lizard brain makes us feel we're in control. If we didn't have a conscious sense of agency, we'd feel like helpless passengers...
"
We must believe in free will, we have no choice"
Isaac Bashevis Singer