Jesus stated that he came with a sword. He was the one who commanded Moses and Joshua to absolutely destroy the cities before them that would not surrender to Israel's banner.
This same Christ flooded the earth and destroyed all the wicked of Noah's day. He destroyed Israel and Judea for rejecting Him. And he had the Romans destroy Jerusalem after his crucifixion.
Through his apostle John, we find that Jesus will destroy most of the inhabitants of the earth in the last days, as well. Just look at all the destroying angels, plagues, disasters, and wars prophecied in the Book of Revelation! Then, those not found in the Book of Life will be cast into a lake of fire and brimstone.
Seems like Joseph is in good company. Christ offered peace and blessings for those who accepted Him and his gospel. He also offered destruction for the wicked. Christ worked this way anciently through his prophets and apostles, and he continues to give such warnings through his modern prophets.
But Joseph also taught how we can escape the destructions promised to the wicked by our Savior. He said that if we keep the commandments and follow Christ, we will be blessed in our lands. This teaching is throughout the Book of Mormon and D&C. And it fits perfectly with Christ's call to repentance - either we repent and follow Christ and His servants, or we are destroyed.
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