How do you define, quantify, qualify it? Is there an objective definition? Doctors are faced with medical dilemmas and subject to moral evil. Think of goodness, free will and determination, responsibility, and so-called "necessary evil". What about when evil is used to stop evil, does evil triumph, and in such a situation when is it that the resistance against evil augment evil itself, ultimately making evil triumph? Consider that humans are complex creatures and variables have to be considered, like, for example, the degree of free-will versus determination that plays into ones decision. Consider natural disasters and psychology as being beyond choice. But also consider when one has alternatives and knows the difference between necessary and unnecessary actions. Is killing "good" when you do it for your country, but bad when its personal? Does evil to one man grant him the right to evil in return? There can also be a range of evils, some more moral and more natural than others. Moral evil by definition involves the element of free will/choice. Must pain and suffering be weighed to judge the action of a person, or should one consider the progenitor's role and knowledge first? The sciences have indicated that we are all, to some degree, conditioned to every act. Pain and suffering must be addressed before the act and there must be the question of necessary versus unnecessary evil. Maybe evil is just a primal term that says more about our ignorance than anything else and is a surviving concept of a primitive bygone era.