evil does not exist in any form it is merely as Ayer puts it emotional ejaculations to our naturalistic reactions to things. For example someone being murdered evokes repulsive feelings as well as error due to the hyperactivation of our sympathetic nervous system hence we view murder as inherently wrong. You may counter this and say our intuitions are the foundations for our morals but when you consider that they are socially preconditioned this loses its cutting edge. Morality has not been a pragmatic basis for human civilization and it has been continually side stepped because innately human are primal animals thus evil cannot exist for morality is a mere metaphysical attribution that cannot be actualized in the physical world. There is no faculty in our mind that categorically recognizes evil or good unless you can prove to me otherwise. In other words as John Mackie said morality is metaphysically Queer.Simply put morality is dysteleogical in a world that has been run on bloodshed and savagery. Despite the existence of polytheism and religion as well as even moral precepts humans have committed heinous acts simply because morality can never be empirically verifiable making it loses any sense of its epistemological basis. Our amygdala does not look at rose tinted morals when we make impulsive reactions that our somehow evil in themselves, thus our anger our fear cannot be deemed as evil but natural courses of human nature.
If you believe in morality from a deity you have to contend with the Euthyphro dilemma does god command our actions because it is good or does god command our actions because they are intrinsically good which leads to self defeating scenarios for morality either that god can arbitrarily change morality hindering its sphere of influence or god chooses what is good because it is good in that case morality takes power over god.
Evil simply cannot exist because ascribing evil to moral precepts or to some subjective visceral reaction is inherently irrational but also subjective in nature. Our ancestors cared little for morality and often thought pragmatically by killing predators larger then them so that they could survive and reproduce in what is known as Darwin's theory of survival of the fittest. Morality if anything has become institutionalized and evil acts which are not evil have been given labels. Rape, murder, genocide and some of the evil depravities the world has ever seen are simply normal and are apart of the deterministic chains of cause and effect, they are a prerequisite for existence thus evil in a sense cannot truly exist for it is a determinant in a world that requires it to function making it is label of evil erroneous and subjective as it is part and parcel of human nature.
so why are we talking about evil if does not exist?