Good overcomes evil. A fairy tale. An Old Wives' Tale. A fantasy based upon impossibility.
Good always plays by the book doesn't hit below the belt doesn't lie doesn't cheat doesn't sabotage doesn't betray.
It is illogical to believe good can ever overcome/vanquish/destroy/obliterate/annihilate/ vaporize/massacre/slaughter/grind up/ crush evil. Yet people do. Why?