I don’t agree completely. Using lions as a comparison doesn’t really work imo since their behavioural patterns differ greatly from ours.
Gratitude always served as the foundation of our communities. It’s what motivates us to look out and care for one another and work as a group. Humans are herd animals so it has an evolutionary advantage to be kind to people. Being excluded from a community (which is the most common response to dicks) usually meant dying.
For people who didn’t suffer that fate, it kind of went something like this: Your parents and other community members take care of you as a child (instinctively). You notice that and feel gratitude, motivating you to return the favor by doing something for other members of your community. They feel grateful as a response and also want to return the favor. Ideally, this loop continues.
It used to work way better, the Neolithic Revolution really fucked things up but it still works.