I'm always reminded of the video where one monkey is rewarded with a cucumber and one with a grape[1]. Certainly getting a cucumber is infinitely better than not having a cucumber, and yet the monkey protests.

Despite having higher cognitive functions, that impulse still exists and can only be suppressed for so long and so far. No one has infinite capacity to maintain what they see as unfairness indefinitely, especially when it seems that humans make their own rules.

1. Capuchin monkey fairness experiment, total duration: 57s, https://www.youtube.com/watch?v=-KSryJXDpZo