Another school shooting happen in California

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I don't know if anyone heard the news about another shooting just happen in California, Taft high school. A student brought a shotgun to school, to seek revenge on the 2 of his schoolmate who bullied him for while. Luckily, the science teacher was brave enough to confront him and in attempt to persuade him to give up his weapon. Eventually, no one get hurt until the police arrived at the scene. So, what's up with our fellow teens nowadays. They seems seek solution over killings, or revenge with violent. Was that something related to the Television or movies they have seen? Or psychologically, we have rough time during the teenagers years right now in comparison to the older of ourselves?