In many cases (not saying it's the case for the OP) people look to blame magic/being possessed etc because it means the problem is external and easier to accept to the individual and their families. Mental illness is still a massive taboo within the Asian community and rather than accepting one is bi-polar or schizophrenic etc, they will blame something supernatural.
It's easier for you to say, and yet, you are doing the same thing.
Have you ever been exposed to places where dark magic is practiced?
I don't know what will serve for blaming magic/being possessed rather than accept the fault? You make it sound like we are talking about unsuccessful people. Usually, it's people with wealth, or something they have, gets targeted by people who gives contract to person in expert of magic. People who are involved, are mostly unpar gawar with backward mentality taught - needed to be introduced to 21st century. However, dark magic is another weapon to utilize, and that being said, each person will always have enemy as much as friend.
Whether it's successful person, rich, and much more, are likely to be targeted big time, and also, exposed to the physical threats, for instance, kidnapping, bhatta...etc, you name it, are quite equivalent in the backward society.
I come from village where people who are derived of necessities and aren't content with world, in our case, in content with Allaah's grace, retort to tactics that are spiritually and physically harmful.
The solution is education to eradicate poverty, that being said, people with poor Emaan, for instance, jealousy, insecurities..etc, are likely to be exposed to weapon to utilize to meet their needs. Unfortunately, there is always bad apple in every nation, community, and in every family.
Look like you haven't been exposed to villages where dark magic is openly practiced. Perhaps, you have no clue what is happening. Dark magic is very powerful weapon, but can be negated only by positive spirituality obtained through prayers - to seek help from Allaah. That's why today's science has no clue to mental illness, depression and what not. There is solution to physical medical condition, but spiritually medical condition is in dire need - can be easily resolved by prayers, in our case, Islamic prayer - seeking help from Allaah (SWT).
