That is trying to play with semantics. A disorder is an illness
Semantics are important here to differenciate between different ways of dealing with it properly. People should know that narcissists/psycopaths/sociopaths cannot change to the better, because the inherent nature is not accepting any flaw. Only by knowing this other people can protect themselves by not keeping contact to them. It's the only way to protect yourself.
The sad truth is that part of being a narcissist, psychopath, or sociopath is not accepting any flaws. These three types of disorders are self-sustaining; their inherent nature makes it almost impossible to change for the better.
They are classified as personality disorders because they involve stable, deeply ingrained patterns of behavior and thought, rather than episodic disruptions typical of mental illnesses. Treatment is challenging due to the ingrained nature of these traits, lack of self-awareness, and resistance to change. Cognitive-behavioral therapy and other therapeutic approaches can help manage symptoms but cannot cure the fundamental personality traits. The primary goal is to mitigate the disorder's impact on the individual's life and those around them.
Where in those sources does it say that it's an illness? It says it's a disorder.
Also, it states the prognoses is "poor".
Being a psycopath/sociopath/narcisist is not a mental illness, but a personality disorder. The affected person does not suffer from it, but the surrounding people. It is dangerous, and it cannot be treated.
Somehow I think the whole planet is endangered ...
Have you researched the reasons for "representative democracy"?
These are the reasons that come to mind at the moment, but there are likely many more.
Look at Brexit for an example of what can happen when people can vote directly.
Time to find interests that don't depend on a company taking advantage of my consumption habits.
It's the only decentralized communication protocol for personal messages that is widely adopted. And yes, it's a privacy nightmare.
How about the customers that are both time- and price sensitive?
You linked "Mental Disorder", which can be a whole bunch of things including mental illnesses, but I'm talking about "Personality Disorder" specifically, which can almost never be cured.
The question is who we should try to protect. You can tell a narcisist to seek help for sure, but also tell others to stay away from that narcisist until he/she has changed to an empathetic being (which rarely happens). Narcisists don't see a reason to change, as they feel entiled to see other people in their lives as resources. Each of them is hurting many people through manipulation and explotation. If you meet a psycopath/sociotpath/narcisist, there's only one advice: run!