I can think of two reasons, I’m sure there are more:
“I am too ignorant, lacking in imagination or stupid to think of anything else, therefore god/aliens did it”
Arguably the most common logical fallacy used by believers in virtually all religions: “Post hoc ergo propter hoc” (After this therefore because of this) EG Bloke prays for his cancer to be cured, he goes into remission. It’s obvious his prayer worked (rather than the chemo therapy). -------Meso America; there is a drought. A human sacrifice is made in desperation. It starts to rain the next day. Obviously human sacrifice works. Next time, no rain, so more human sacrifices, increasing the number until there is rain.
It is my position that all human activity has (or once had) a purpose, and follows its own logic The logic may be sound , but the inference false.
Thought for today : “None of us is as stupid as all of us” (Anon)
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Corollary: One could indeed gain the impression that magic works from watching the excellent series of Harry Potter documentaries . Of course it doesn’t work for muggles. 
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