A single decisive charismatic person can do more than a group, a committee. The group of people is slow to act, is biased to think about the same answers to the problem. Its members are mostly occupied about thinking what other people are thinking. It can’t make a decision because it must satisfy the interests of all its members. It is occupied by establishing internal hierarchy.
Individuals are wired to think in social terms. How their actions impact the group. They feel pain when they are rejected by the group. They feel pleasure when they are accepted by the group. There is information highway built into their brain that absorbs and analyzes their relationship to the group. On a biological level, humans can’t escape other people. Somehow mother nature prefers we cooperate with each other and don’t live alone.