Suicide is predictable.
You may predict individual suicide with talk about: Feeling unbearable pain. Death or a recent fascination with death. Feeling hopeless, worthless, or trapped. Feeling guilt, shame, or anger. Feeling like they are a burden to others
Individual suicide may be predicted with behavior or mood including: Recent suicide attempt. Increased alcohol or drug use. Losing interest in personal appearance or hygiene. Withdrawing from family, friends, or community. Saying goodbye to friends and family. Giving away prized possessions. A recent episode of depression, emotional distress, and/or anxiety. Changes in eating and/or sleeping patterns. Becoming violent or being a victim of violence. Expressing rage. Recklessness.
Suicide may be predicted for society and species. Rather than astrology we have the sociology. Rather than numerology we have moral statistics. Rather than cartomancy we map the family structure. Rather than extispicy we have biochemistry and genetics.
Rather than necromancy we have suicide autopsies to decide if suicide could have been and should have been predicted.