Yes,indeed it does exist bcs there are many planes of existence. Sometimes the planes of existence clash and we see things we aren't supposed to see. People who practise black magic know how to harness and make use of beings that exist in other planes of existence. The power of black magic is very real and can be deadly so it's best to keep clear of such stuff.

It's scary in east malaysia,thailand,indonesia,south africa and many third world countries. Those who are highly skeptical run the risk of getting cursed bcs a powerful practitioner will feel insulted if we say stuff that make them feel small.

I agree many cases are due to mental diseases (hereditary/hormonal imbalance etc) and psychological factors but a small %tage are due to black magic.