JC - Chapter 26

After finding great resistance and rejection from a Samaritan village as they apostles attempted to prepare the way for the visit of the Savior, they said to the Savior -

"...Lord, wilt thou that we command fire to come down from heaven, and consume them, even as Elias did?"  (New Testament | Luke 9:54)

To which the Savior rebuked -

"...Ye know not what manner of spirit ye are of.
56 For the Son of man is not come to destroy men's lives, but to save them."  (New Testament | Luke 9:55 - 56)

Many times, in our frustrations with many wicked cities, we have the same thoughts.  Obviously, there may also be citizens that will repent and turn to the Lord much like Amulek.

Later, as the Savior ordained and sent out the Seventy,

"...whosoever will not receive you, when ye go out of that city, shake off the very dust from your feet for a testimony against them."  (New Testament | Luke 9:5)

Even adding -

"...It shall be more tolerable for the land of Sodom and Gomorrha in the day of judgment, than for that city."  (New Testament | Matthew 10:15)

Elder Talmage commented -

"If rejected in any city, they were to depart therefrom, leaving, however, their solemn testimony that the city had turned away from the kingdom of God, which had been brought to its doors, and attesting the same by ridding themselves of the dust of that place.  It was not for them to pronounce anathema or curse, but the Lord assured them that such a city would bring upon itself a fate worse than the doom of Sodom.  He reminded them that they were His servants, and therefore whoever heard or refused to hear them would be judged as having so treated Him."

It is clear that dusting off ones feet was a testimony not a curse.