Indeed correlation does not imply causation, and we should remain skeptical at all times, especially when someone tries to push their hypothesis on us without letting us formulate or own (not saying it's the case here btw, this post is just two datasets).
In this case, though, I'd say the hypothesis of people disappearing in caved makes sense logically. And, I mean, it's not like we can check for solid proof since the people were lost. Sure we could lead huge search parties to see how many skeletons we'd find in the caves but that sounds like a waste of resources. So I'd say in this case the hypothesis that people tend to get lost in caves is the best thing we got.

Helps with credibility though.

Yup I didn't lol
I was just talking about the author of the tweet in the post

Yet, differences between the rich and the poor are getting deeper and deeper. In fact we've come to the point when some places like the LDCs are actually worse off than they were 50 years ago. But it's the third world and we don't like to talk about it because we'd have to admit we've been exploiting it for centuries.

Yes! That's what I've been doing as well