How can evil people become good people?

How can evil people become good people?
The problem of evil is with us worldwide; and we in all lands and in all cultures wrestle with it.
The common solution adopted in all time and in all cultures is the motivation of fear. What's constantly proclaimed is, Do what's right and you won't have to suffer. So we have policemen everywhere, and "the law." In some lands, including the U.S., the jails are full.
But the problem of evil and evil people continues. So people say, Let's be practical: fear has to be the motivation that works. Fill the prisons! But the gospel of Jesus Christ is based on a different motivation: the power of God's "much more abounding grace." That only can change human hearts from evil to righteousness.
John the Baptist told the people, "Behold the Lamb of God, which taketh away the sin of the world" (John 1:29). John was right in what he said! Jesus does "take away" the sin of the world! By His sacrifice on His cross He has redeemed the entire world. The Father sent Him to "give life unto the world" (John 6:33). Even our daily bread which we eat is purchased for us by His sacrifice. Jesus accomplished something for every one, even though most people disregard Him!
But if we "eat" without acknowledging our indebtedness to Him, we "eat ... damnation" to our souls because of our unbelief (see 1 Cor. 11:29).