The whole idea of existence is predicated on the assumption that we exist.
We exist because we exist. What about hopefulness? That would merely be an automatic response to whatever stimuli that is existent within the person’s life at the exact time the need rendered itself.
Would then it safely be accurate to determine a person’s hopefulness based on findings from a persons use-fullness in existance? I would say, no. there would not be a usefull-ness in existence because you aren’t offering anyone anything except adding to a joint collective.