Actually, it's about who had the greatest influence on world events, whether for good or for ill.
Per Time (via Wiki): Person of the Year (called Man of the Year until 1999) is an annual issue of the United States news magazine Time that features and profiles a person, a group, an idea, or an object that "for better or for worse...has done the most to influence the events of the year".https://en.wikipedia.org/wiki/Time_Person_of_the_Year
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"We have met the enemy and he is us."