The angels told Lot to get his family together because God was going to destroy Sodom and Gomorrah. They were going to escape the judgment of God.

Jesus' Second Coming is going to be like that.

God is righteous and holy and He cannot allow evil to continue which at a certain point, a nation, a society, or the entire world will cross the line and judgment will occur. God's patience and love has run out. He must stop the evil.