It seems so obvious that he was a danger to society, from classmates stories of his behavior to the warning to his parents from his victim, that he was a ticking time bomb. What could we have done better to prevent this horrific outcome? His adoptive parents probably wanted to do something good by bringing him here from Russia, but did the Russian authorities recognize he was damaged goods and just want rid of him, or did he recognize he wasn't wanted anywhere and that lack of love embitter him towards the world? I suppose in a community that glorifies vampires and a nation that spends $7 trillion on senseless wars in 15 years we probably shouldn't ask why people become crazy but why more don't. Now our gov't has just given our obviously corrupt and incompetent military a raise that would have paid for state college for everyone. This while cutting minimal medical aid to the poor. Who, really, are the crazy ones? 
http://www.informationclearinghouse.info/47841.htm