Im gonna go ahead and butt in, if you dont mind.
Can you clarify what you mean by "morality can remain objective in relation to sentience, suffering, and kindness"? I get the feeling I know what you mean, but I want you to make your points clearer so I can better understand and possibly refute your stance.
And also, if you want to go that far, you can say that moral ojectivity is lazy too since it paints every moral dilemna in black and white.
In saying that I mean: If you know all data relevant to the psyches, previous interactions, previous experiences in the same arena, and the immediate scenario; even the shades of grey become illuminated objectively.
bare example(further detail for hypothetical provided if requested)
A woman running alone in the park at night who had been sexually abused as a child, hearing someone chasing her, gaining, then proceeding to turn and stab them in the neck when they place a hand on her shoulder has done nothing wrong. The pathways in her brain have developed in such a way that this flash of a response is understandable, even if the person chasing her had a good reason. If she had say, dropped her keys. They should have called out to her. This would, in my opinion, fall into the category of a blameless tragedy. If you really want to get technical, the blame rests with the person who abused her in childhood. It is however, not direct blame, as they did not do
this particular wrong themselves.
A man running alone in the park during the day, with no history of abuse, committing the same action when feeling the hand on his shoulder would have just murdered someone.
I do not believe objectivity in this realm of thinking lends itself only to black, and white. When I referenced kindness in relation to sentience, I meant: A thinking being can make the choice to not respond harshly, even if harsh response is deserved. In this same way, action and inaction can be used along a continuum of moral responsibility.
I'm not rushing off to New Guinea to help build wells for small villages. Instead I study, because I believe in maintaining a balance in being good to yourself, and the world around you.
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Life's intrinsic value:
It's in the significance of moments in perceivable time, as held in the mind of an awareness that values itself, the Universe surrounding it, and the other beings that it relates to in some way.
Regardless that there will likely be an end to all things, that there is a definite end to the self, the time that we do have has intrinsic value granted in the essence of a sentience relation to existence itself. Time itself is not fully understood, and could be a product of what created the known Universe, not existing separate from it. Perhaps life exists somewhere out there, not bound by the time that we know. If time is not a requisite for action, would the actions of a timeless being similar to a kind/merciful/selfless human action have more value, simply because it wouldn't die at some later point?
This is not a God question. It is a hypothetical as if the creature asserted is identical to a modern human in every respect other than relation to time/death/decay.