Well if you look far back enough in Mormon history, there is an explanation, albeit a really messed up one. Granted, this is a view I do not believe in because, c'mon. really? lol
Original Mormons believed that if one lived a truly pure life, we're talking not even a single sin to repent here, that they would be granted godhood and control over their own planet in which to create their own life. So in effect, their own former god made them gods and they go on and make more god candidates and the cycle repeats endlessly. But since technically the amount of Mormons to make that list were so few and sparse, even less than the amount of Judas Priests think heaven allows, there is plenty of room for everyone to make their own messed up coven of mutants. But that was after going back in research for this stuff which is obviously not taught in today's Mormon circles.
They also thought Polygamy was hawt :D