Ex-mormon, the canon is that to go to “outer darkness” you need to have perfect faith in god, like you know he exists as you know your dog exists, and still deny him. So practically the only people on earth eligible to go there are those who’ve actually seen him or have been sufficiently convinced by one of his angels or miracles, or otherwise witnessed some heavenly shit like that that sheds all doubt, which is why Hitler probably didn’t go there. Also now that I’m remembering this, the “outer darkness” isn’t really a place, you just get shunned by god (light being a metaphor for god and truth)