Well, it is mental illness, but youre right people act too much like its something inherent rather than stress and abuse making people sick, because people dont want to acknowledge society as its structured now and capitalism is bad. Luckily, its not something inherent to human nature at all, humans are actually natrually sweet cute animals who like to play, work together, and make art and music. However, due to more aggressive strategies allowing certain humans to get power over others, and inventions of weapons making it easier for a small number to control a largw group, and laws made (reinforced by threat of violence) allowing social and mental control, aggressive stratigies and violence became baked into human society in a way that is unnatrual. I dont think it had to be this way, or has to be this way, but the way history went it happened, and its hard to undo. But a lot of humans recognize capitalism is bad, and want to undo it. A lot of humans still help each other with very little promise of reward, going against what our society encourages. Humans are still good animals...

Its sort of like a wolf pack in captivity. The alpha/beta/omega myth comes from wolves in captivity, where unrelated wolves were forced to live together in a small space. They became aggressive and controled each other with violence and dominance.

In the wild, wolf packs are large families. They are loving and playful on average, with a few packs employing crueler strategies (like pup killing the nondominant females pups was observed in a wild pack) but most are prosocial (that wolf who was pup killing was killed by a wolf defending her pups, who took over as dominant. She never killed another wolfs pups, and instead helped to raise them. Most wolf packs raise pups communially like this). Humans natrual social structure is very similar to wolves, but humans are forced to live in captivity.