When our ancestors lived ──
on each other.
Everybody was scared.
If there wasn’t enough food to go around, somebody starved.
And if there wasn’t enough shelter or clothing to keep everybody warm, somebody froze or got sick and died.
So it was everybody for himself or herself just to stay alive.
The strong and the clever people either beat up the others or tricked them into being dead or out of the way.
Some wise people decided that this was a very stupid way to go on living, always being scared of each other.