Violence and evilness are hard to measure.
Nowadays psychologists have next to IQ invented the E(mpathy)Q
Empathy can be measured with question lists. It turned out that (unappreciated) violent acts are mostly done by people with a low EQ or an EQ = 0
Research among monoclonal twins showed that like the IQ the EQ is fairly genetical.
Of course nurture has also an influence on IQ and EQ
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Violence and evilness are hard to measure. Nowadays psychologists have next to IQ invented the E(mpathy)Q Empathy can be measured with question lists. It turned out that (unappreciated) violent acts are mostly done by people with a low EQ or an EQ = 0 Research among monoclonal twins showed that like the IQ the EQ is fairly genetical. Of course nurture has also an influence on IQ and EQ