Evil or Bad is that which destroys or inhibits the refuge and beauty of the world. Acts from Ignorance or enlightenment can both do good, just as chance events can cause good or evil. But Knowledge of the world will usually help you do more good, like having a map in a maze..

Belief strength should scale with information and evidence. By knowing the areas in which you have a strong base of knowledge and those where you don't you can avoid being unintentionally dishonest, and promoting detrimental action.