Objectivity may be beyond humans. The only truths we can be sure of are tautological truths. Tautologies are prescriptively true. It is based on language and the meaning of words which, while we must agree on them in order to communicate, are subjective by their very nature.
Each of these kinds of behaviors promotes survival of the special which is literally the only thin that natural selection rewards.
Elaborate.
It is a very simple concept. Behaviors that are detrimental to species survival (even if they superficially benefit the individual) tend to be weeded out. That leaves only behaviors that aid in species survival and those which do not hinder a species survival.
Amongst such behaviors are
Those that promote species interest (sometimes manifesting as altruism/empathy).
Those that promote self interest (so long as they are not detrimental to the species) as individual survival is necessary for a viable species.
Those that are incidental but not detrimental to species or individual survival.
Those which once promoted species or individual survival but which no longer serve their purpose in an organism's current environment.