No, you as an individual don't 'need' to do that. What does 'need' even mean? Require to survive? Making societally optimal decisions is a crazy burden to try

No, you as an individual don't 'need' to do that. What does 'need' even mean? Require to survive? Making societally optimal decisions is a crazy burden to try to put on a single person. As single entities we don't have near the amount of information or power required to act on that impetus with any weight. Society as a whole needs to establish norms, and perhaps regulations, to ensure it doesn't fall apart. Individuals should consider those norms in their decisions (and fight to make them better). But slapping someone with the responsibility to be a single person acting alone to maximize happiness for their collective is asking them to be impotently act on shoddy heuristics.