Sir, The answer is a fiasco, A debacle.
We cannot determine evil or purity. It's the game of concept, and perception. You may see the world in an evil way, and, evil will have you see it in the first gaze. Evil will appear if you have the glance of the world with despair, malice and satanic thoughts. Assuming the world as one, you cannot define evil and good. There will always be good and bad. Evil and Purity, Demons and Angels, Devil and God. The world may consist of positive and negative, it's hard to picture oneself answering an question as such, it's like a paradox.
Humans, for example, are in ways, both good and bad. Humans will always choose the side that seems the easiest, they'll avoid any road that's full of obstacles and hindrances.
Today, the one you helped few years ago, stabs you in the back. It's a massacre of humanity. Humans are cruel beings, the world is cruel, the world is evil, but in this world, it is upon us, to share goodness, be good, and pass the positivity to others.