Good, Bad: Right, Wrong: Justified, Unjustified: Justice, Injustice: Evil.
Good is that which produces happiness, joy, pleasure, comfort, health, ease, knowledge, understanding, love, empathy, etc.
Bad is that which produces sadness, depression, stress, pain, sickness, ignorance, intolerance, hatred, anger, animosity, poverty, prejudice, persecution, etc.
Right is that which results in Good.
Wrong is that which results in Bad.
Justified is that which is Right or that results in both Good and Bad but the Good outweighs the Bad.
Unjustified is that which is Wrong or that results in both Good and Bad but the Bad outweighs the Good.
Justice is distinguishing between Justified and Unjustified and choosing that which is Justified.
Injustice is failure to distinguish between Justified and Unjustified and/or choosing that which is Unjustified.
Evil is the predominance of Unjustified over Justified. Evil is either willfully chosen, or the result of ignorance. Since ignorance is preventable and curable, Evil should never be tolerated.
Human beings are fallible and perfection is beyond human capabilities. Any opinion, belief, action, proposal, policy, individual, or organization that asserts otherwise is the alarm bell of pending disaster.
It is the duty of everyone to do the best they can to know the facts so far as they are able to find them and before reaching a decision to evaluate all opinions, beliefs, actions, proposals, policies, individuals, and organizations to determine if they are Good or Bad, Right or Wrong, Justified or Unjustified. It is the neglect of this duty that is the source of all Evil.