To elaborate, imagine that Alice's view as the goal of humanity is epistemological enlightenment. And Bob's is happiness of individuals. And Carlos thinks it's survival of humans as a race. What would be their ideas of the ideal environment for a human being? Or even, are their idea of a human being the same? What would they think about cloning or eugenics? What about economical structure, social structure? How would they compare the value of life to other values? So on and so forth...
Without survival of the species there are no happy individuals nor there can be any enlightenment.
Just a thought.
Agreed. But every individual, or every perspective within an individual, or every different ideology, puts different weights on these and other values. There is the knowledge aspect, such as scientific predictions of extinction events or the feasibility of colonizing other planets or religious dogma (such as believing that apocalypse should not be avoided). There are also values used to decide, based on this knowledge, what the best outcome is for the will to realize itself. For instance, some people would prefer dying over living in pain. Entire populations probably wouldn't, but it's not something we can predict.