People missing because of Bunian

After coming across an interesting fact that Orang Bunian has a special plot dedicated for them in facebook, I went ahead with the research on these beings. I headed to the National Library website and search for articles on Orang Bunian. There I found a number of articles that seems to blame Orang Bunian for the disappearance of people around the village.

Why are they blamed on the disappearance of people?

I have heard that humans sometimes crossover to the land of Orang Bunian by accident. Thus, causing them to 'disappear' from the real world.