3 Nephi 7

20 And the people saw it, and did witness of it, and were angry with him because of his power; and he did also do many more miracles, in the sight of the people, in the name of Jesus.
21 And it came to pass that the thirty and first year did pass away, and there were but few who were converted unto the Lord; but as many as were converted did truly signify unto the people that they had been visited by the power and Spirit of God, which was in Jesus Christ, in whom they believed.

It's tempting to think that if only people could see the hand of God in some miraculous way they would accept the truth. I have wished for that in the lives of my own family from time to time. But miracles of that type don't convert. The witness of the Holy Ghost, spirit to spirit, is what changes hearts and minds. When someone is "visited by the power and Spirit of God" and comes to know that Jesus Christ is their savior, there is change. They repent and turn to God.