Most human specific traits were selected for because of their advantage during tribal warfare. War is a team-player super-predator activity, with the bar of difficultly gradually raised automatically as fighters evolve. This explains why humans evolved intelligence far in excess of the natural need to find food or shelter.
Although Darwin wrote about the tribal warfare, modern evolutionists are very uncomfortable with war being such a significant driver of human evolution. It means we are war makers by nature and this trait can't be suppressed. The problem is humans could not have evolved by natural selection alone. There is insufficient evolutionary pressure to explain our trajectory. This refusal to acknowledge our war making disposition gives creationists a valid point: natural selection can't explain human evolution. It just doesn't add up.
Religion, by the way, serves as a powerful advantage during tribal warfare. A tribe with religion beats one without almost every time. That is why so many of us have the gift of religious faith.
Pack animals hunt and exist on instinct and fear. In fact fear is their entire motivating factor. Even within the pack, survival is the ruler. a wolf certainly does keep a kill for itself, especially males. The female is first to eat her kill the cubs fight for the leftover and establish a pecking order.
As for all that "human selection" stuff, blah blah blah. Humans didn't "evolve" they were created with rational, thinking minds, something animals do not possess. We posses all the same faculties we were created with. Our adaptability is all information stored in our genes that becomes active as our environment warrants. Move to the mountains, each generation will develop bigger lungs. If they move back to sea level, they reduce. Always has been that way.