2 Peter 3:15 & 16
Bear in mind that our Lord's patience means salvation, just as our dear brother Paul also wrote you with the wisdom that God gave him. He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.
Why does God allow the evil to continue and even to increase? The simple answer is found here as Peter says that it is patience and the opportunity for people to be saved. Peter and Paul had some early disagreement but they were able to settle their differences and work together to further the kingdom as we see Peter defending him here. In light of the fact that Jesus is coming soon, we should follow this example and just get about the business of sharing Jesus with as many people as we can.