Currently people of Caribbean origin in the UK have 9 times the percentage of schizophrenia as is found in the other population.
The British press argues that this is caused by the stress of immigration, and then social pressures in UK.
It is highly unlikely the British press will violate their own code of political correctness to deal with the wave of mentally ill people being shipped in from other countries! In reality schizophrenia is hereditary, but it's currently untreatable. Even Los Vegas social services folks give bus tickets to Los Angeles to Schizophrenia victims. The Caribbean nations simply do that on a larger scale.
It is.not hereditary. It is learned.