&gt; it makes it sound like these actions could be expected from anyone at anytime<p>They can. A neurotypical person&#x27;s brain could spontaneously generate a violent psychotic episode due to a stroke or adrenergic tumor or somesuch. Just like any area of the sky could spontaneously throw a lightning strike at you at any time. It&#x27;s <i>low probability</i>, certainly, but murder is a low-probability event to begin with.<p>The important point is that a model with &quot;non-deterministic&quot; people in it has more predictive power, <i>epidemiologically</i>, than a model where it&#x27;s impossible to become a murderer without &quot;warning signs.&quot; It&#x27;s not at all &quot;writing human behavior off&quot;; the fact that the model includes randomness can actually help you prevent murders more effectively, by leading you toward strategies to cope with unpredictable murders—e.g. building education toward methods of &quot;de-escalation&quot; for psychotic episodes, crimes of passion, etc. into your society—rather than simply trying to reinforce policing and social work.