What, we wonder, can be done to prevent such unpredictable outbreaks of violence? No, we can't always pinpoint when a specific individual will erupt in a spree of deadly violence. But it is just possible that we can begin to create a less violent society, a society in which nonviolent conflict reconciliation is a more widely-held value, a society in which individuals with serious mental health problems are more likely to be identified and more likely to receive needed treatment and care.