Have you ever thought that when people or animals group together, their main reasoning for doing so is to protect each other from harm?. Also just for social stigmas such as mainly the social aspect of it.
Humans like each others company and like to speak to each other. They like this because as evolution progressed, herd animals grouped together for safety reasons. Meaning that the more of you in a group the harder it is for any harm to come to you.
Animals such as monkeys or gorillas, they have a leader who maintains order and is possibly the first to fight if any harm is going to come to the herd.
