Look at it this way, if a person acts wickedly toward you, why should you make yourself into his evil image? That is the impractical way of this wicked world. If somone calls you names, must you berate him? If one lies or backbites or gossips about you, must you repay him, and yourself by becoming a hateful liar or backbiter or gossiper, lowering yourself to his level? Would he not thereby show himself the stronger, in that he changes you into his image, his evil practices becoming your practices?
Rendering evil for evil sets in motion a vicious circle of evil-doing. Lie begets lie, hate breeds more hate, violence spawns greater violence, and the circle of evil gains momentum as each races in the wicked footsteps of the other, trying to outstrip the other in evil-doing, striving to repay the other with greater evil.
True christians will shun such snares by refusing to complete the first circle or set it in motion by returning evil for evil. Instead, they will counter with good. “Do not let yourself be conquered by the evil, but keep conquering the evil with the good.”—Matt. 5:44; Rom. 12:21,
The point to consider is - that God would not have granted his creatures moral freedom and at the same time prevented them from doing evil should they choose to do so. Jesus referred to a misuse of free will when he said of the Devil: “He did not stand fast in the truth.” (John 8:44) That statement clearly indicates that the one who became the Devil was originally a perfect spirit person, who at one time did “stand fast in the truth.” Jehovah God made his creatures free moral agents because he loves us. So whose side are you on?