Rat poison

What is mentally ill? Emotional coldness, inability to understand feelings of others, unwillingness to see situations of others, that they are more than  what you can see and how different kinds of issues affect lives, what lies behind: inability to comprehend and sympathise with emotions and happenings of anybody, realities of different kinds. What is it all about when only when something is felt and experienced personally comprehension and sharing can happen? What is mentally ill really when sharing is one-sided and interest lies in the personal, in visibility, gain, and emphasis is on what do I get, what is in there for me, who is this person for me or to anyone?