Mormon 5:14

And behold they shall go unto the unbelieving of the Jews; and for this intent shall they go: that they may be persuaded that Jesus is the Christ, the Son of the living God; that the Father may bring about, through his most beloved, his great and eternal purpose, in the restoring the Jews, or all the house of Israel, to the land of their inheritance, which the Lord their God hath given them, unto the fulfilling of his covenant,

These writings will go to the Jews who don’t believe. This is why they will go to them. They might be convinced that Jesus is the Christ. He is the Son of the living God. Then the Father can complete his great plan through his most loved Son. He will bring the Jews back to their land. He will bring all the house of Israel back to the land God gave them. This will complete his promise.

They’ll go to the Jews who don’t yet believe. That’s the whole point—to persuade them that Jesus is the Christ, the Son of the living God. Through his beloved Son, the Father will fulfill his great and eternal purpose: bringing the Jews—all the house of Israel—back to the land he promised them, keeping his covenant.