Suppose the planet earth is planet Australia, full of the worst human refuse from their world and they are just flying by to surveil their penetentiary.
Suppose they gifted Christ to see if the hoards were ready to have an injection of humanity. By
That actually sounds plausible, and has been proposed quite often. There are very detailed descriptions concerning how souls are collected after death, debriefed, and then reincarnated for additional rehabilitation. Given the nature of humans, it is difficult to refute.