Researchers said that terrorist groups and networks seem to avoid recruiting people with mental health problems, "probably because they share some of the same stigmatised views as the rest of society and see people with mental health conditions as unreliable, difficult to train, and a security threat."
Recent attention has shifted to "lone actor" terrorism, in which mental illnesses are more common, they said.
However, they point out that no single diagnosis is associated with "lone actor" terrorism, and that a psychiatric diagnosis where appropriate does not explain motivation.
Researchers said that many health practitioners are concerned about the government's counterterrorism strategy, which outlines a public duty to assess, report and prevent radicalisation if this may lead to extremist violence.
They point to a lack of transparency which means there is a "paucity of published evidence" for the effectiveness of the programme.
This undermines trust and has alarmed many health practitioners, "who are concerned about acting as agents of the state."
He added that psychiatrists are not in the role to deal with extremism, but are there to help those with mental health problems.
"An effective counterterrorism strategy, which is in all our interests, will be more successful if it engages fully with mental health professionals, public health agencies, and communities, making the research evidence and recommended actions as transparent as possible without undermining genuine security concerns," researchers said.
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