Well, that makes sense. It reduces stress for a while and postpones suicides.
https://www.researchgate.net/profile/Jayne_Cooper/publicatio...
> Conclusions: The results highlight the importance in a suicide prevention strategy of early intervention after an episode of self-harm. Treatment should include attention to physical illness, alcohol problems, and living circumstances. Self-harm appears to confer a particularly high risk of suicide in female patients.
http://research.bmh.manchester.ac.uk/cmhs/research/centrefor...
> 11. Over half the patients who died by suicide had a history of alcohol or drug misuse. There were national differences, with alcohol misuse a more common antecedent of suicide in Scotland and Northern Ireland, drug misuse more common in Scotland. However, a much smaller group was in contact with specialist substance misuse services