Riiight....Black bears aren't dangerous.
List of fatal bear attacks in North America - Wikipedia
Not common, but they do happen. Many years ago, one killed a kid in a friend's church group, camping in the Smokies. Pulled up this link just now:
https://www.reddit.com/r/CampingandHiking/comments/2bwyjd See that chain link fence on the front of that shelter?