&gt; But there is something absurd about the possibility that a person with a demonstrated propensity for mass violence might be returned to society at large without any legal restrictions, psychological treatment, or period of supervision.<p>There is nothing illegal in wanting to kill people. There is nothing illegal in having radical religious (or other) beliefs. Free societies don&#x27;t punish thought crime.<p>The only thing the law enforcement&#x2F;legal system can legally and morally do, is to mark him as a potential threat (and increase surveillance) like they would with any other suspected terrorist.