Evrything must be good what about wrong?

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We in our character and naturally way of life want, need and it's logic to look at the good things, to want to be good,perfect. We was teached and we teach our children only the good way in life, of course that this is the right and best way be a good person for best humanity.But are we learned an learn our children how to behaviour with wrong,bed,ugly? What is your opinion?