Yeah its origin is probably closer to an uncanny valley "thing looks human but doesn't act human and is dangerous."

There's usually a kernel of truth in a lot of the old indigenous legends and stories. These become traditions and rituals over time but likely started as practices to guard against actual dangers. Like funerary practices. If you go with exposure you don't leave the body near where you live. Or you bury the dead. You might do this to "respect the spirits" but it also prevents disease and/or attracting undesired animals to your location.