Reading something, and experiencing something are two different things.
I have several brothers, and we all grew up in the same family, yet the rest of us got on in life, married, worked, and had rather 'normal' lives, though none of us keep in touch with each other. But that's a whole other issue.
I will say that I think there are many 'predatory' people in the world, I have come across a few of them, and they also have a way of 'throwing off' a conversation - in other words, if one gets too close and asks too many questions, they will quickly turn the conversation onto a whole new topic, and only later will you realize they never answered you at all.
The Casey Anthony trial of 2011 here in Florida was an example - Anthony was accused of murdering her 2-1/2 little girl, whose body was found a few blocks from her residence, and her car trunk reeked of human decomposition. It was a First Degree Murder trial.
Well Anthony told so many whoppers from Day 1, accusing this one and that one, giving police the names of people who didn't even exist, that no one ever figured out what really happened, and she was acquitted. Partially I think because of her ability to manipulate the facts.
And I don't think they ever determined whether she was a sociopath or a psychopath, or whatever - perhaps there are more categories!
But certainly some of them can be dangerous - which is why I was quite happy that my brother moved away.