The illusion of unanimity in a group is one aspect of

The illusion of unanimity in a group is one aspect of: Groupthink

Groupthink is a practice that discourage individual argument by only allowed people with the same opinion to enter the group.
a Group think will create an illusion that their idea is always can be accepted by other people beside their group because simply no member within that group who could challenge their idea

Since the time there were born it depends, there's fun violence, abuse, r@pe, kidnappings, threats, hostages ect.

C; skin, is the answer!