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  • He had a personality disorder, a surprisingly large proportion of people are believed to have them.

    'Antisocial personality disorder' is what we used to call psychopathy. Psychologists are reluctant to label patients 'psychopaths' these days - for the obvious reasons.

    Psychopaths make up around 1 in 150 of the general population - along with sociopaths this is thought to come to about 1 in 100.

    Like you say, it's relatively common - of this forums 17,445 members - with all things being equal (assuming psychopaths are likely to participate in a public forum at the same rate as the general public) - there are likely 104 psychopaths.

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