xerox, pali sniper, waikiki sniper, kakaako sniper. all over a decade or more, yet no attempt to discover what drove them to shooting innocent people. 
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even with uyesugi, people don't just snap over one incident and become violent killers. they do leave a trail of red flags. but, it is difficult to detect. it takes work.
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the state has done nothing to seek the root causes for each incident other than the easy enactment of restrictive gun laws.