The Golden Rule assumes we collectively wish to be at peace and in harmony with each other.
Yet there are people who care only for themselves and what their greedy self desires.
Often greed is bound up in mystical beliefs and a focus on evil for its own sake.
If we have the right nurture we will respect the beliefs of others as they respect how we see things.
The Devil is how good people describe or justify the the evil acts of evil people. They separate the evil from an enemy, family member, neighbor, or colleague who may may not be perfect and desires a chance.