Best photos of the day: Berlin protesters and Halloween dogs

The Guardian’s picture editors bring you a selection of photo highlights from around the world, including elections in Japan, an anti-racism protest in Berlin and Halloween festivities in New York

Psychopathy is a developmental disorder. It doesn’t emerge out of nowhere in adulthood – all psychopathic adults show signs during adolescence or childhood.

But this doesn’t mean we should label a child a psychopath – far from it. No responsible researcher or clinician ever would. Even though every adult psychopath began as a psychopathic child, the reverse is not true: many children with high psychopathy scores do not go on to become adult psychopaths. 

And remission can occur in response to favourable changes in a child’s environment, or as a result of innate developmental processes. But the fact that children can strongly express psychopathic traits should not be ignored.

What is sometimes overlooked is the impact on parents. During our research, the stories they told us about their children were heart-rending. Often they worried about what new episode of violence or theft or destructiveness each day would bring, about the safety of their other children and about their own safety.