I have lived behind the Zion curtain for years. The underwear is not secret, nor magic. Not a one can tell you why plural marriage was "the most important tenet" of the religion a bit of a century after it was "no longer practiced". Not a one can really explain exaltation. Just like there isn't a Christian in a thousand that can explain the Trinity.
I have, and had, many mormon employees, even mormon relatives. Most are salt of the earth, decent people. Some are not. One employee ended up with two women pregnant at the same time, and only one was his wife (but not for long.... apparently that whole plural marriage thing actually DID go away!). They are just people, with work horses, show horses, ne'er do wells, welfare queens and crooks in the usual proportions.
