To be honest, with the world we live in, the high stress society, particularly at a time when unemployment is high and money is low, I am surprised that more of this kind of thing does not take place. Heck, I'm sure that everyone has had a D-Fens moment but it's that key in psychology that separates those who do from those who don't.
I feel so sorry for those who were just in the wrong place at the wrong time...what a mess