It has been around us from the dawn of knowledge. Evil is the anti-knowledge. The animal within. It rejects our strive to grow beyond the mediocre thoughts humans have. Evil is no devil which creeps amongst us in different forms, whispering in our ear, tempting us to disregard our conscience.
Evil is a term created by ignorance to describe fear.
Fear is the enemy of man. Fear created sea monsters, and wood fairies. Fear created governments, and churches. Fear is the source of intimidation over reason. Mankind has lived with fear since his distinguishment from all other forms of life on Earth.