If we concentrate on the evil in the world, invariably we become bitter and unhappy. We blame it all on God instead of pressing on to understand the mystery that is life, and yes the mystery, that is God.
Of course, we shouldn't become unconcerned when we encounter evil, no matter how it manifests itself. That would in itself be compounding the problem of evil.
We should, instead, focus on making good out of evil. It also opens up the possibility that some people out there--clever souls they--may be inventive enough to make evil out of good. It all depends what spin you place on each side of the mirror.
It is sometimes said that good is incomplete without its opposite, evil, and evil is meaningless were it not for the existence of good. A reality that consisted of only one of the two would be an impossibility and would be unstable in very little time.
Therefore, it follows, that in a perfect or complete world or reality, we need both good and evil.