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The wilderness is dangerous for obvious reasons, away from society, no signal, your supplies are limited to what you're carrying.
However, the wilderness is dangerous on a spiritual level because you are alone with your thoughts. When Christ fasted for 40 days in the wilderness, he was accosted by demons. If you think some fat dude achieved enlightenment, siddartha guatama sat under the boddhi tree alone and was also confronted by demons. The demons are able to tempt you in your everyday life with sloth,wrath,pride,lust,etc.
When the demons see you quite unbothered and more or less at some kind of peace, they rush to tempt you. that is why people have paranormal encounters in the woods.