How is it that Narcissists are incapable of love and emotions are they mentally ill?

Answer

N's are not mentally ill, NPD is a personality disorder People who are N are aware of what they are doing, they just don't care as long as they get what they want.

Answer

Narcissists are capable of love! They just don't have the same behavior patterns as most of us and consider the person they love as "their property" to do as they wish with. The jury is out as far as psychiatrist trying to figure out if narcissism is genetic or a learned habit. It comes under a "condition" rather than mental illness. The narcissist is a controller, feels they are much more intellectual than those around them and can be dramatic at making a point of making others believe their solution to any problems or any quote they make is the right one and everyone else is wrong! There than making their point clear to driving everyone around them crazy, they are actually socially inept and often loners. If someone says they were in a bad car accident and were hospitalized for 2 weeks the narcissist will concoct or bring up a memory of a past similar event and embellish on it. In other words their car accident was far worse than the person they are talking too. Narcissists entangle their victims in a web of deceit and instill fear into their victim. They seldom will go for counseling because although they will admit to a psychiatrist/psychologist they know nothing about either, they will continue on in an egomaniacal manner and consider psychiatrist/psychologist inferior and thus, few if any narcissistic people are every helped.
If you know one, are dating one, living with one, end the relationship.

Another answer

I hope whoever wrote the above reads this. You have summed up a lot for me, and articulated it well. I am in the very relationship you described. The pain he has inflicted on me is immeasurable. I understand why abused women stay in the relationship now. I tell him we have a bipolar relationship: the ups are orgasmically high, and the downs make me suicidal. And I usually get to experience both multiple times a day. I would like to add that I believe the narcissist is aware of what to hide in the beginning of a relationship. They know if they show their true colors initially, no one would ever be with them. I do believe he's capable of love, but not as defined by everyone else. And when he is hurt, he lashes out with the absolute cruelest verbal abuse. I can't believe anyone who claims to love another would ever say those things. I never have. There is a line in any relationship, be it marriage, friendship, working, that does vary, but should never be crossed if one wants to maintain that relationship. And you are right, everyone should be warned. But like I said, it isn't always apparent until it is too late. This man is my addiction.

Another answer

They are so self absorbed and controlling, they start believing the scenario they create in their own minds and that is their way of being. Mental illness often has to do with an imbalance in the brain that is naturally chemically deprived. Narcissists can be mentally ill, too, but that is not the same. People can become narcissistic all on their own. The world is out to get them, you know.