the Yen Yang, one cannot exist without the other. Apparent evil has created good, the same with good. Example: Hitlers actions and beliefs are considered evil. Yet much good came from his actions. People are more tolerant and careful of others beliefs and differences. A good worldwide morality came about and laws trying to prevent such things from happening again. Evil begat good. Good has begat evil, as in Innocent travel and intent on honest trade not murder, has caused disease and death for whole civilizations.
One can only do the best that one can do. In hopes good rings true.