What does it mean to say that mental illness is a modern-day leprosy? I was reading about mental illnesses and then thought one day that the uninformed regard mental illnesses the same way leprosy was regarded.

I looked up about leprosy and some papers and articles about how mental illness is a modern-day leprosy, but I can't seem to find as to what exactly is the relation, if they are even thinking the same thing I am.

So far I know, it is observed that the uninformed are not giving them the treatment they need. Specifically, why are the uninformed not giving them the treatment they need?

Is it accurate and precise to say that mental illness is regarded as modern-day leprosy since:


In ancient times (or Jesus's time), uninformed people believed people who had leprosy had leprosy because they committed a grave sin or sins
In modern times, uninformed people believe people who have mental illnesses have mental illnesses because they committed gravely immoral actions (see how I avoid the non-secular word "sin") ?


Take for example a drug or gambling addict. Drug and gambling addictions are mental illnesses, but an uninformed person would look at a drug or gambling addict and say that the reason that they have these sicknesses is that they started taking drugs or gambling, the immoral action.

However maybe an informed person would say that the reverse is the case: the immoral actions of starting to take drugs or gamble is caused in part by the illness that the person had or the biological, psychological or environmental predispositions that the person had.

Other examples would include procrastination, overeating or hyperactivity.

Bottom line, is it accurate and precise to say that the term "modern leprosy" is in reference to thinking:


  You're crazy because you did evil things


rather than


  You did evil things because you're mentally ill ?


This question may not be very clear so please recommend how I can improve this question.
This term depicts a wide spread problem in society that the term 'mental illness' carries with it stigmas and negative connotations.

Firstly, From a psychologist's perspective, we want people with mental illnesses to recognise them and seek help/treatment so that the problem can be solved. However, negative labels often cause people to ignore signs of mental illness. The effect is that fewer people with problems are seeking help from them, causing them and those around them to suffer for it.

Secondly, mental illnesses carry no moral significance or worth. An individual afflicted by a mental illness has done nothing to deserve it. It is unfair on them to be ostracized for something beyond their control, however this is often what happens with mental illnesses.

Leprosy has been greatly feared and shunned for thousands of years by humans everywhere. An individual with leprosy would be separated from the society and would be forced to survive on their own or find a leper colony if they were lucky. This is similar to how many people suffering mental illness suffer today. Often they cannot take care of themselves, and are shunned regardless of their suffering.