Any Mormons I have met, are very nice people. It’s just that they are following an incorrect belief system.
Jesus was complete in what He did. Nothing else was needed or ever will be needed.
This has nothing to do with Jesus being or not being completed or takes away anything it is about the rest of the children returning home in the latter days.
It is the LDS belief that in the Latter days Jesus restore His Church once more upon the earth.
For many reason to prepare for His second coming and to gather the flock and a place to take refuge (Zion) during he coming storm of trials and tribulations.
So much is being done most folks are not even aware nor care some only wish to weight down the load!