Why shouldn't one person have ultimate power in a society?

One person having ultimate power can lead to authoritarianism, stifling dissent and limiting freedoms. It often results in the concentration of power and potential abuse, as unchecked authority can disregard the needs and rights of the populace. Additionally, diverse perspectives are essential for a balanced and just society, and a single ruler may lack the insight and wisdom to address complex societal issues effectively. Ultimately, shared power promotes accountability and encourages more equitable governance.