There are millions of mormons who believe EVERYTHING bad about non-mormon faiths, and proselytize by preaching that only mormons have the "true gospel" and that's what they're going to do.
Sounds like schadenfreude to me.
Your comment also prompted me to think: Do mainstream Mormons proselytize the fLDS? If not, why not? Do the mainstream Mormons send missionaries to fundamentalist Mormons in Hildale, UT & Colorado City AZ & Bountiful BC & certain parts of Juarez, Mexico? If not, that would seem to confirm the duplicity of Salt Lake's LDS HQ: Here they say fLDS is another "faith" yet for some reason this is the only "faith" not to receive standard house-to-house visitations from Mormon missionaries!