Not a big fun of the concept of "Emotions accumulate down here and manifest stuff, including monsters".
Here's waiting for the big reveal that the sky people are actually dumping either something with malicious intent to cause those things to happen, or some kind of run off from something of theirs aware of consequences an uncaring about it. (I like the latter more)
What can I say? I like a bit more of science with my magic, rather than pure "It's magic, just go with it".