The evil in this world is necessary and unavoidable, As long as there is free will in this world, people will take advantage of it and use it for evil, it wont end until Christ’s return. But God is patient and waits, to prove His mercy and to allow people to take action towards salvation. His will is that no one perishes but that all come to the knowledge of him and be saved.
It makes us understand that evil is here to stay, and until Jesus’s second return it will not end. It should be understood as being part of life and we should take advantage of God’s patience and use it towards winning as many souls as possible for the kingdom of God.