Fear is deeply motivating force. We are either safe or we are in danger. And for danger there is danger and then there is life threatening danger.
As a species we have persisted mostly because of this advanced fear motivator. We are risk mitigating pack animals. Sticking to the groups is a way to mitigate the risk.
When the basic security is achieved, then other needs to tend to pop up and through which we start to want to influence through the group and even control the group. That’s when the other motivators come in like having a social status and power.
Because of pack mentality, some kind of hierarchy always exists. A good question to ask is how high the hierarchy needs to be? The higher the hierarchy is, the more likely it is to be used wrongly and unethically. The more involved all the members of the group are, the healthier it is.
Also the lower the group hierarchy is, the better we can use our individual and collective wisdom. Even physically and biologically in a secure environment we can use our higher cognitive functions better and if we can think better and can communicate better the results are going to be better as well.
Humans are risk mitigating pack animals, always creating hierarchies. However in those groups everyone is in the end better with increased security.