I see it this way: part of the stigma of mental health issues is that one must be "crazy", to be defined as "crazy" by the layman one must then do strange or dis turning acts; thus, when a person does something the average person can make no logical sense of - the person who committed the action must be "crazy", but .. if someone wants to be "politically correct" instead of saying "This person is crazy", it will be said "This person is mentally ill".

Does that make it correct to do? No

Will it be an accurate statement? At times yes, at other times no

It is just as discriminatory (in my view) as when people make the racial slur "Mexicans are thieves." Is that an accurate statement? Sometimes yes. Sometimes no.

You cannot look at a person and make a judgement without knowing the situation - same as you cannot look at a situation and judge the person without first meeting said person.

That's just my view though. Take it or leave it.

Disclaimer: The racial slur about Mexicans was an example of discrimination, not a personal belief nor advocacy for that belief.