Sloth
The sloth's contribution to society consists primarily of being photographed whilst looking adorable and generating approximately 2.3 million annual social media posts tagged with variations of 'mood' and 'same.' The World Wildlife Fund reports that sloth merchandise alone generates sufficient revenue to fund conservation efforts across seventeen countries.
Additionally, the sloth has become an aspirational figure for overworked millennials worldwide. The phrase 'sloth energy' has entered the corporate lexicon as a surprisingly effective productivity concept—though HR departments remain divided on its merits.
Revenge
Revenge has shaped human civilisation in ways that historians prefer not to calculate too precisely. The Birmingham Centre for Historical Motivation Analysis estimates that vengeance has directly caused approximately 40% of all wars, 67% of literary classics, and 89% of songs written in minor keys.
Without revenge, we would have no Hamlet, no Count of Monte Cristo, and significantly fewer John Wick films. The global entertainment industry owes its fundamental existence to humanity's inability to let things go. Whether this constitutes a positive social impact remains vigorously debated.
VERDICT
Revenge has built empires and destroyed them; the sloth has inspired desk calendars. Scale matters, even when morally ambiguous.