Missing 411, as a whole, does a great job of illustrating just how many people still go missing and die out in the wilderness, and how there's still plenty of dense forest in today's world that's not to be fucked with - even here in the developed US.
Most modern day humans simply aren't built to deal with such terrain.
As for the oddities associated with many of the cases Paulides covers, I'm not sure what to make of it all. But it does seem rather strange for him to have had such a difficult time procuring the necessary information from the park services, to complete his documentary.
I suppose you could attribute that to a fear of poor publicity costing them revenue, however, that can also result from withholding said information - it's a double edged sword to stonewall citizens that wish to view the data (not to mention entirely unethical).