Why are mental illnesses underrated and are considered a taboo?

We can not see mind. In many cultures mental illness was seen as evil possessions.

In a survey of 2,000 people across Britain, almost 30% said they would find it difficult to admit publicly to having a mental illness, compared with 20% who said they would have difficulty coming out as gay.

Almost a third of respondents believed someone with a mental health problem couldn't do a responsible job.