Joseph Smith had multiple wives, and at one point in time he was married to a woman her daughter simultaneously.
What would you expect from a guy who taught that the ultimate achievement of a man is to die and be rewarded with a godhood status over his own planet, along with a wife that will help him create spirit babies to populate it?
I’m not going to pretend that leaders in the Christian world haven’t done the same thing. It’s evil!!
So once they've achieved godhood, they can pardon their mortal soul for the incest, yes? Problem solved (sign me up!).