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Can't reply to webwielder's comment anymore, but your anecdote is not isolated. How cliche is the response to a mass killing, "we had no idea he / she was capab

• coldtea 8y ago
  Well, if they had, they would have put those persons under close surveillance or put them away earlier. So, obviously it's the one's that people "have no idea" that do the acts. That's probably some kind of logical bias with a name and all ("survivorship bias" perhaps: you have to "survive" the scrutiny people get when they appear capable of a horrendous act, to be able to carry such an act out).
• watwut 8y ago
  Quite a few of them had history of trouble if you ask those who knew them closely. Legal troubles, conflicts in school, aggression toward acquitances or/and undiagnized but visible mental health problems. Not all, but way more then obe would expect based on cliché. People who say that iften base it basically on killers ability to respond to "hello" with smile and "hello", but did not spent time with them to know their opinions or troubles.