killer heat

around the whole July, people seemed getting fierce with the uprising temperature ---
i) early July in London- a french boy was cruelly killed (over 30 stabs throughout the body) by 2 English boys ;
ii) early July in Japan - a man committed homicide of about 7 strangers in the street with knife, in revenge to his own dreadfully boring life;
iii) early July in Shanghai - a peking man rushed in the Shanghai police station and got lives of 6 policemen away, protesting his suppressed life along from childhood;
iv) mid-july in U.S. - in U.S. a man got in sight in a BBQ party and shot down a few people;
v) Early Aug in Canada- a chinese man (Mr Lee) immigrated from China 4 years ago hacked impulsively with knife the western boy beside in a midnight-bus and cut his head off.

as most of the above killers are alleged nice all along their lives, aren't they probably also long-suffered victims? Maybe they are escaping from the inner threat in the violent way.
related film in 2003