Can bad really be good? No....don't delude yourself
However...opposites are essential in order to have genuine and accurate knowledge. When we look at others, we can discern them for they are a combination of opposites...light and dark...good or bad.
Without the combination of light and dark or good/bad, a person would be a "compound in one" with the background for he could not be distinguished from the background.
It is in the opposites that we discern knowledge. If all we ever had was the sweet...then we would never know the bitter. And therefore sweetness would have no meaning to us. It is bitter that gives sweetness ddefinition to our senses. Therefore, only through experiencing opposites can we comprehend.
