There is one skill that is present in almost all living species. This skill is the ability to perceive danger, which becomes the difference between life and death in many situations. Species without this ability quickly died out due to natural selection. All humans, by their biological nature, has this ability.
This ability is either reduced or overly enhanced in some individuals, and a lot has to do with the person’s experiences and upbringing. Nowadays, many people tend to overestimate their abilities, and this overestimation quickly reduces the perception of danger. When a person thinks they can take on someone much bigger while being outnumbered at the same time, you know something is wrong with them.