Having personality disorders is not fun, ever. I don't speak from first-hand experience; rather, I speak from the standpoint of a person who has had "intimate" relationships with personality disordered people: a mix of histrionic, antisocial, borderline and narcissistic individuals who were all very different, but with similar mindsets.
I really loved each of them, but they were not able to love their true selves. This made them lie, steal, cheat and harm me and many others around them. This made contradictory and confusing and chaotic. This made them angry, sad, scared, wild, manic and easily frustrated. But it didn't make them evil.
Even though I have had my life threatened by one, my name smeared by a couple, and friends stolen away by all of them, I still recognize that I am luckier than they are and therefore can't feel any long-lasting anger towards them. They were all products of nasty alcoholic parents, awful divorces, incest and abuse. Their whole lives were chaotic and secretive, faked and false. Perhaps the most compelling thing about them, the reason that I was ever friends with them in the first place, was their sensitivity. It's like their skin had been peeled off throughout the years, bit by bit-- they felt everything so deeply they had to turn off their feelings in order to live without chronic emotional pain.
All of them knew they were crazy. They wouldn't tell anybody else this but me, because they knew I wouldn't judge them or tell anybody else. They were afraid of being seen as defective. Though they pissed me off a lot, I did have a lot of admiration for them at the time. I saw them as strong survivors.
It's wrong to demonize those who suffer from personality disorders, because to do so only breeds ignorance of the way they operate and of their true natures. True, some of them are what society considers bad people, but does that mean we should shut them in a box and lock them away in the corners of our minds reserved for mystery? These people are human. They aren't aliens. They're not THAT MUCH of a mystery. And if you think that they are, perhaps you yourself suffer from a lack of empathy and/or imagination, and that might be worth examining.