Could the simplest explanation of why no theory seems to cover everything, be that something we believe to be true actually isn't?
Interesting line of thought. If there were details of the Dyatlov case that central authorities wanted to keep secret, they could have been omitted from the publicly available case files, or worse, parts of the case files could contain fabricated falsehoods. A possible combination of "
missing information plus
misinformation", one might say.
However, I think the withholding of sensitive details, plus deliberate vagueness on the part of the investigators (I have Ivanov and Vorozhdenny in mind), is a lot more believable than outright fabrication of documents or physical evidence. Besides, we would never get anywhere trying to make sense of this case if we could arbitrarily dismiss documented facts as fabrications--we would have no "ground truth" from which to start. We'll have to give documented facts a rebuttable presumption of veracity, that is, "true until proven dubious".
Having said all that, I find it interesting that you didn't say "something we
know to be true", but rather, "something we
believe to be true". The distinction is really important, because much of what many of us believe about the Dyatlov Pass Incident (DPI) is not a matter of "known" fact, but instead,
inference from the bare facts.
For example, many DPI aficionados believe "the hikers cut their tent from the inside to escape", and still more would believe the less-specific "the hikers cut their tent from the inside". But,
based on the case files alone,
Loose}{Cannon has done an excellent job convincing me that the state of the tent has near-zero evidential value ( see
https://forum.dyatlovpass.com/index.php?topic=205.0 ).
Further, many DPI aficionados believe that some of the Dyatlov company dug a "den", with a flooring of tree branches and "seats" made from spare clothing, in or near the ravine. I have some serious misgivings about that ( having read
https://forum.dyatlovpass.com/index.php?topic=17.0 ). All we know is that the searchers found a flooring of branches, laid down by
someone, beneath at least two meters of snow in the ravine...and "hit the bullseye" on
their first their only photographed attempt to dig it out.
Of course, there are other widely accepted DPI "facts" that are not actually facts, but merely inferences from facts. For instance, "the Dyatlov hikers descended Kholat Syakhl in a calm and orderly manner". Footprints preserve trajectory and pace; they do not preserve mental or emotional state.
Another would be that Zolotaryov and Thibeaux-Brignolles were better dressed than the others because they were outside the tent when the triggering event occurred. I actually agree that is the most plausible scenario by far, but again, it's an inference from facts. Instead, perhaps they were better dressed than the others because they lingered in/near the tent longer than the others? Seven of the nine blankets were found crumpled up, but two were found spread out (if I recall correctly). I think it's more likely that the two spread-out blankets belonged to Krivonischenko and Doroshenko, who would have been the first to undress for bed and turn in for the night. But, what if those two blankets belonged to Zolotaryov and Thibeaux-Brignolles, who took the time to "make their beds" and put on their boots while their comrades exited the tent in more of a hurry?
Still another would be that the Dyatlov hikers descended the slope and abandoned their campsite due to
fear of a lethal threat in or around the tent. I honestly have major difficulty imagining any other reason why they would leave their campsite. But, again, "fear of lethal threat" is also an inference from facts.
My point is that maybe we DPI sleuths have put on "cognitive blinders" concerning some aspect of this case, and maybe we need to re-examine what we
know believe.