If one is not robbed of his retirement savings, yet doesn't hear the Gospel, is not called to faith in Jesus, and brought into the fellowship of the redeemed, the gain is for nothing. And what if a person sells drugs and is caught, but learns about Jesus in prison? No matter what may happen to him from there, the blessings of the Gospel echoes through eternity.
Evil will always collapse under its own weight. And when evil is thwarted we can rejoice that God has good things in store for us through his Son. Jesus and his eternally-good plans will not be thwarted.