How do establish value for anything? I would say that the value of anything, life included, would be dependent on its relative usefulness to the entity in question. I can’t think of a better process to analyze the elements of usefulness in any case better than science. With sufficient information science can perspectively describe the value of anything, including instances of sentimentality.
I agree
Unfortunately the future is unknown
Except for predictions in physics
Which I would contend are not really predictions but projections of the behaviour of the physics system
Give scientists (or a group of nurses) a large bunch of newborns to rate relative usefulness how many do you think you would guess correctly at say their age of 20?
When I was showing mums, who required some tips on baby care, if the baby gave a large burp I would predict the kid would be a politician
No idea of my success rate