It's a horrible thing to see happening more and more often. I don't think there is any one answer to why,either. Our society has changed the way we deal with family and children. It's a complex issue. More violence in the streets, in the schools , on television, movies, games, music...and kids feel isolated already. Add teasing and ridicule and you can get a volatile reaction.
Just my two cents worth.
Cloudy
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Storm-Queen
StormCloud of the Black Knight