It is the foundation upon which all that follows will be built. These questions, like many that mankind has asked, are fundamental to the learning process, and to spiritual growth. To ask why, is the first step in conquering ignorance. Evil is the condition that exists when good does nothing. Good is the light of creative action.
Evil is the darkness of inaction.
Where there is no good, there is only evil. Where there is no light, there is only darkness. This fundamental truth must be fully understood. Action is the key to all existence. Without action, there is only stasis and the emptiness of nonexistence.