We as human beings are not only social animals, we are also consensus builders. In order to be social, we have to want to avoid conflict and promote harmony. If you think about it from an evolutionary standpoint, conflict is ultimately non-productive. An organism that is in constant conflict with the environment around it is, by definition, not appropriate for that environment. Furthermore, if you don’t find ways to fit into the environment that you find yourself in, you’re going to lose out to another organism that has found ways to make the environment its home.