Understanding is hardly the &quot;only&quot; potent defense.  There are better ways to prevent things like this from happening but they are also pretty unpalatable to modern society.<p>Holding families accountable for treason worked pretty well in feudal cultures.  Same here.  Put the onus of responsibility for prevention of tragedy on the family.  Failure to report &#x2F; take adequate measures is negligence.<p>Also I think you are making the mistake most engineers make about the mentally unwell:  that they can be &quot;fixed&quot; if only they were &quot;diagnosed&quot; early enough.<p>Very little evidence this is the case.  You can medicate someone to the point they don&#x27;t care anymore but you can&#x27;t really fix bugs in their programming.