‘I can’t believe it was him.’

‘He seemed like such a normal person.’

‘Everyone on this street liked him so much.’

‘He was always so polite and nice to everyone.’

Those were just some of the comments made by friends and neighbors of infamous serial killers such as Jeffrey Dahmer, Ted Bundy, John Wayne Gacy, and Dennis Rader (the BTK Killer). And the reasons behind such remarks are simple.

Psychopaths, viewed by many psychiatrists as “society’s most dangerous individuals”, don’t act or look crazy. They’re not mentally ill. They don’t suffer seizures, blackouts, or lose track of reality due to their condition. In fact, they’re not only masters at appearing normal to everyone around them, they’re also experts at gaining people’s trust.

Now allow me explain why that is.

A Psychopath’s main characteristic is what psychologists call “severe emotional detachment”, or SED for short. SED is one of the hardest “mental abnormalities” to diagnose - harder than schizophrenia, bipolar disorder, psychosis and even borderline personality disorder, but what does SED really mean?

In layman’s terms, “severe emotional detachment” simply means an inability to experience feelings such as love, sympathy, pity, affection, compassion, mercy, empathy, remorse, guilt and so on. Psychopaths literally do not feel emotions towards other human beings, but here’s the thing – they act like they do. So why would someone, totally lacking on sentiment, go to great lengths to mask that condition?

The answer to that question is also quite simple.

Psychopaths do know right from wrong. They don’t have a warped concept of reality and they don’t live in a fantasy world inside their heads. Quite the opposite, actually. Psychopaths tend to be very grounded people. They realize that not feeling any emotions whatsoever towards other human beings would one - be considered wrong by society, and two – bring unwanted attention to them. With that knowledge, they do what comes naturally to them - they fake their emotions so not to be cast aside by everyone around them.

The truth is that psychopaths are pathological liars, who love to con and manipulate others. The scary part of that truth is that they are usually very good at it and to catch them on one of those lies is a monstrous task.

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"Psychopaths can be understanding, friendly, helpful, sympathetic...whatever the situation calls for, and their acting will be Oscar worthy."
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During my time as a criminal behavior psychologist in the USA, I interviewed hundreds of killers, many of them serial. Rarely did any of them seem out of the ordinary in any way. On the contrary, I interviewed killers who were as charming, funny and charismatic as a chat show host. Some looked so scared and fragile, one would be forgiven for wanting to give them a hug and tell them that everything would be okay. A few of them looked like kind grandfathers, who you wouldn’t think twice about sitting down and having a cup of tea with. As scary as it sounds, the biggest common trait I found linking almost every psychopath I interviewed in my career, was the fact that they all looked and behaved as ordinarily as most people you would encounter in your everyday life. They can be funny when they need to be. They can be understanding, friendly, helpful, sympathetic... whatever the situation calls for, and their acting will be Oscar worthy.