I would think that if one is able to face the Prince of Darkness, they would be able to face the challenges inherent in the World of Horrors.
I dislike the WoH terminus.. for my taste, it smells of bunker mentality and group think. But anyway, I would like to extend this a bit further. Set just is no peaceful, ever-loving, chilled-out god. And what kind of Setians should that be that does
not feel akin to Set?! Of course, among beings akin to Set, ever-peacy politness and kindness just cannot be expected. And if it is expected, then I do not see what this has to do with Set, Setianism and so on. If it is for pure knowledge and so on, Thoth is the right one, not Set.
Well, I do not avow that all Setians would waste their time battling each other, don't take me wrong. But the kind of brutality and mercilessness that Set features cannot be had with being good, polite children all the time. The prince of darkness (I dislike this term, too) is
not a gentleman - or, maybe he is, but he has a very special definition of what a gentleman is like..
If one puts the very same demands to an LHP religion/philosophy as to conventional ones, you will end up with a conventional belief system, that's it. Disrupting beliefs, destroying world views, "the great midday" (Nietzsche) - THAT is LHP. LHP is just not for weaklings hiding behind rank, name, conventions and laws since all of these are to be overcome, and that is impossible while clinging onto them.